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Description:

The U.S. Bureau of the Census implemented major changes to the design of the Survey of Income and Program Participation (SIPP) with the panel begun in 1996. The revised survey design emphasized longitudinal applications and the Census Bureau attempted to understand and resolve the seam bias common to longitudinal surveys. In addition to the substantive and administrative redesign of the survey, the Census Bureau is improving the data processing procedures which yield microdata files for the public to analyse. The wave-by-wave data products are being edited and imputed with a longitudinal element rather than cross-sectionally, carrying forward information from a prior wave that is missing in the current wave. The longitudinal data products will be enhanced, both by the redesigned survey and new processing procedures. Simple methods of imputing data over time are being replaced with more sophisticated methods that do not attenuate seam bias. The longitudinal sample is expanding to include more observations which were nonrespondents in one or more waves. Longitudinal weights will be applied to the file to support person-based longitudinal analysis for calendar years or longer periods of time (up to four years).

Description:

This article extends and further develops the method proposed by Pfeffermann, Skinner and Humphreys (1998) for the estimation of gross flows in the presence of classification errors. The main feature of that method is the use of auxiliary information at the individual level which circumvents the need for validation data for estimating the misclassification rates. The new developments in this article are the establishment of conditions for model identification, a study of the properties of a model goodness of fit statistic and modifications to the sample likelihood to account for missing data and informative sampling. The new developments are illustrated by a small Monte-Carlo simulation study.

Description:

The study of social mobility, between labour market statuses or between income levels, for example, is often based on the analysis of mobility matrices. When comparing these transition matrices, with a view to evaluating behavioural changes, one often forgets that the data derive from a sample survey and are therefore affected by sampling variances. Similarly, it is assumed that the responses collected correspond to the ' true value.'

Description:

A longitudinal study on a cohort of pupils in the secondary school has been conducted in an Italian region since 1986 in order to study the transition from school to working life. The information have been collected at every sweep by a mail questionnaire and, at the final sweep, by a face-to-face interview, where retrospective questions referring back to the whole observation period have been asked. The gross flows between different discrete states - still in the school system, in the labour force without a job, in the labour force with a job - may then be estimated both from prospective and retrospective data, and the recall effect may be evaluated. Moreover, the conditions observed by the two different techniques may be regarded as two indicators of the 'true' unobservable condition, thus leading to the specification and estimation of a latent class model. In this framework, a Markov chain hypothesis may be introduced and evaluated in order to estimate the transition probabilities between the states, once they are corrected or the classification errors. Since the information collected by mail show a given amount of missing data in terms of unit nonresponse, the 'missing' category is also introduced in the model specification.

Description:

The log-linear modelling of categorical longitudinal survey data on income is studied. An emphasis is on inference about change. Special attention is paid to modelling of longitudinal data from two waves. A small illustration is based on data from the Canadian Survey of Labour and Income Dynamics.

Description:

The purpose of the present study is to utilize panel data from the Current Population Survey (CPS) to examine the effects of unit nonresponse. Because most nonrespondents to the CPS are respondents during at least one month-in-sample, data from other months can be used to compare the characteristics of complete respondents and panel nonrespondents and to evaluate nonresponse adjustment procedures. In the current paper we present analyses utilizing CPS panel data to illustrate the effects of unit nonresponse. After adjusting for nonresponse, additional comparisons are also made to evaluate the effects of nonresponse adjustment. The implications of the findings and suggestions for further research are discussed.

Description:

The disseminated results of annual business surveys inevitably contain statistics that are changing. Since the economic sphere is increasingly dynamic, a simple difference of aggregates between n-l and n is no longer sufficient to provide an overall description of what has happened. The change calculation module in the new generation of annual business surveys divides overall change into various components (births, deaths, inter-industry migration) and calculates change on the basis of a constant field, assigning special importance to restructurings. The main difficulties lie in establishing subsamples, reweighting, calibrating according to calculable changes, and taking account of restructuring.

Description:

We address the problem of estimation for the income dynamics statistics calculated from complex longitudinal surveys. In addition, we compare two design-based estimators of longitudinal proportions and transition rates in terms of variability under large attrition rates. One estimator is based on the cross-sectional samples for the estimation of the income class boundaries at each time period and on the longitudinal sample for the estimation of the longitudinal counts; the other estimator is entirely based on the longitudinal sample, both for the estimation of the class boundaries and the longitudinal counts. We develop Taylor linearization-type variance estimators for both the longitudinal and the mixed estimator under the assumption of no change in the population, and for the mixed estimator when there is change.

Description:

In longitudinal surveys, sample subjects are observed over several time points. This feature typically leads to dependent observations on the same subject, in addition to the customary correlations across subjects induced by the sample design. Much research in the literature has focussed on modeling the marginal mean of a response as a function of covariates. Liang and Zeger (1986) used generalized estimating equations (GEE), requiring only correct specification of the marginal mean, and obtained standard errors of regression parameter estimates and associated Wald tests, assuming a "working" correlation structure for the repeated measurements on a sample subject. Rotnitzky and Jewell (1990) developed quasi-score tests and Rao-Scott adjustments to "working" quasi-score tests under marginal models. These methods are asymptotically robust to misspecification of the within-subject correlation structure, but assume independence of sample subjects which is not satisfied for complex longitudinal survey data based on stratified multi-stage sampling. We proposed asymptotically valid Wald and quasi-score tests for longitudinal survey data, using the Taylor Linearization and jackknife methods. Alternative tests, based on Rao-Scott adjustments to naive tests that ignore survey design features and on Bonferroni-t, are also developed. These tests are particularly useful when the effective degrees of freedom, usually taken as the total number of sample primary units (clusters) minus the number of strata, is small.

Description:

Two-phase sampling designs have been conducted in waves to estimate the incidence of a rare disease such as dementia. Estimation of disease incidence from longitudinal dementia study has to appropriately adjust for data missing by death as well as the sampling design used at each study wave. In this paper we adopt a selection model approach to model the missing data by death and use a likelihood approach to derive incidence estimates. A modified EM algorithm is used to deal with data missing by sampling selection. The non-paramedic jackknife variance estimator is used to derive variance estimates for the model parameters and the incidence estimates. The proposed approaches are applied to data from the Indianapolis-Ibadan Dementia Study.

Description:

The statistics in this section are in six main divisions: federal income security programs (series Cl-195); federal and provincial income insurance programs (series C196-286); cost-shared federal-provincial income security programs (series C287-442); federal and provincial social service programs (series C443-507); provincial-municipal income security programs (series C508-559); government expenditures on social security by broad program areas (series C560-599).

Description:

This section provides series relating to the labour force, employment, unemployment and job vacancies. For the most part, the series are obtained from publications of Statistics Canada, formerly the Dominion Bureau of Statistics. Some of the older series are directly from census tabulations while others are derived from such tabulations but incorporate adjustments to improve the consistency of the series through time. Many of the series of more recent vintage are derived from the Labour Force Survey. Also included are series from the Statistics Canada Employment Survey, the Statistics Canada Job Vacancy Survey, the set of Help-Wanted Indexes developed in the Department of Finance and taken over subsequently by Statistics Canada, and a few other series.

Description:

The statistics of this section are in eight parts as follows: labour income (series E1-40); employment, earnings and hours of work (series E41-135); employer labour cost (series E136-151); unemployment insurance (series E152-171); employment service (series E172-174); labour unions and strikes and lockouts (series E175-197); index numbers of wage rates, wage rates and salaries (series E198-375); workmen's compensation (series E376-389).

Description:

The statistical data of this section are in five subsections. They contain data on national income and expenditure and related aggregates from 1926 to 1976 in series F1-152; on income produced, by industry, from 1919 to 1926 and on gross capital formation from 1901 to 1930 in series F153-182; on the stock of tangible capital from 1926 onwards in series F183-220 and on inventory book values in series F221-224; on real gross domestic product by industry in series F225-240; and on indexes of labour productivity in series F241-294.

Description:

The statistics presented in this section are in three major divisions. The first of these, series G1-151, cover private and official estimates of the balance of payments on current and capital account from 1900 to 1975. This subsection is itself divided into three parts: series G1-56 contain the estimates of the balance of payments of Professors Jacob Viner and Frank Knox for the period 1900 to 1926; series G57-83 contain the official estimates of the balance of payments, current account, prepared by Statistics Canada (formerly Dominion Bureau of Statistics) for the period 1926 to 1975; series G84-152 contain the official estimates of the balance of payments, capital account for 1926 to 1975.

Description:

The data contained in this section for the most part relate only to the revenues, expenditures and debt of the federal, provincial and municipal governments proper. The first part of the chapter contains information on the finances of the federal government from Confederation to 1975. The second part contains information on the finances of all governments for various years since 1933 to 1975. The final part of the chapter contains miscellaneous data relating to various aspects of governmental finance.

Description:

The data of this section are presented in six groups as follows: the supply of money, series J1-54; central banking, series J55-74; chartered banking, series J75-272; other financial institutions, series J273-470; issues of stocks and bonds, yields and exchange rates, series J471-567; and year-end financial assets and liabilities according to the financial flow accounts, series J568-875.

Description:

The price indexes presented herein have been grouped into seven subsections, namely: (1) consumer price indexes, series K1-32, (2) wholesale price indexes, series K33-55, (3) export and import price indexes, series K56-67, (4) industry selling price indexes, series K68-107, (5) construction price statistics, series K108-159, (6) fixed capital stocks implicit price indexes, series K160-171, and (7) implicit price indexes of gross national expenditures, series K172-183.

Description: This section is concerned with those statistics referring to the allocation of lands and the production of forests. To some extent, these two questions are compatible only in that they have fallen under the same administrative unit for the purposes of management and data collection. They continue together in this volume as a matter of convenience. The data relating to land refer to the allocation of lands for settlement, production and recreation, and are, wherever possible, reported at both the national and provincial level. Those data relating to forests are concerned with primary products, the manufacturing of lumber, pulp and paper, and exports. Sources, together with problems or qualifications associated with them, are identified in each table by footnotes.

Description:

The statistics of agriculture presented here are in five sections. Series Ml-248 are the general statistics of the industry, covering such topics as farm population, area of farms, capital employed, cash income and prices of farm products. Series M249-309 are crop statistics, showing acreage, production and value of the various crops. Series M310-412 are livestock statistics, showing number and value of livestock on farms as well as production and disposition of various livestock products. Series M413-489 show exports and domestic disappearance of grains, animals and animal products, and food produced and consumed, per capita. Series M490-525 are miscellaneous statistics such as sales through marketing boards and purchases through co-operatives and farm implement and fertilizer sales.

Description:

This second edition of R&D tax treatment in Canada: a provincial comparison, uses a method developed by the Conference Board of Canada to compare the tax incentives to do research and development (R&D) in each of the provinces. The results contribute to the analysis of regional differences in science and technology activity in Canada, as part of the work of the Science, Innovation and Electronic Information Division of Statistics Canada.

An example of a regional difference is the tax incentive to do R&D in a province. There is the federal Scientific Research and Experimental Development tax programme, which has regional variations. Six out of ten provinces have their own incentive programmes and tax rates which differ from province to province. The B-Index analysis of the Conference Board provides a means of comparing tax incentives and of providing an indicator.

Description:

This publication presents the national gross domestic expenditures on research and development (GERD) from 1988 to 1999 as well as the provincial GERD from 1988 to 1997. An additional series of tables showing research and development (R&D) expenditures at the national level in either science from 1963 to 1987, or at the provincial level from 1979 to 1987, may be obtained from the Science and Innovation Surveys Section, Science, Innovation and Electronic Information Division.

Description:

This working paper presents the estimation procedures used to calculate the research and development (R&D) expenditures in the higher education sector for the year 1979-80 to 1997-98.

Description:

Computer communications occur when someone connects a computer to a communications network to access information on the Internet, to send and receive e-mail, or to use electronic banking services. This article uses 1998 data to update previous estimates of the proportion of Canadian households regularly using computer communications, analyzing the relationships between usage and location of use, household income, and other demographic factors. The article also looks at the growth of household connectedness over the past year, as well as the time spent using computer communications from home for a variety of services that can be accessed through the Internet.

Description:

This service bulletin presents the geographic distribution of federal government science and technologyexpenditures. Data on federal government expenditures on science and technology are found in Volume 23,No. 5 of this publication, released in October, 1999. In both this and the earlier bulletin, science and technology (S&T) expenditure is the sum of expenditures on research and development (R&D) and on related scientific activities (RSA).

Description:

The statistics presented in this bulletin are derived from our latest survey of industrial research and development activities in Canada. The survey reports on the research and development spending intentions for 1999, the estimates for 1998 and the actual expenditures for 1997 of corporations performing research and development activities in Canada. In 1997, a decision was made to eliminate the short survey forms in favour of administrative data, in order to reduce the response burden.

Description: Fifteen years ago in this series, A. Romaniuc published a comprehensive study of how fertility in Canada had evolved over the century. It described the phenomenal increase of fertility in the postwar period, resulting in the baby boom. With the largest cohorts ever known in Canada, the baby boomers, by their numbers alone, will have left their mark on Canada's social, economic and political structure throughout their life cycle.

Description: At the beginning of this century, a Canadian male could expect to live an average of 47 years and a Canadian female, 50 years. At that time, barely 38% of males and 44% of females reached the respectable age of 65 years. They could then expect to live for roughly another decade.

Description:

As the century draws to a close, there are many topics of interest involving Canada's aboriginal peoples: self-government, land claims, the environment, the criminal justice system, urbanization, the labour market, education, etc. However, one topic receives little attention but could have a major impact on how the others will develop: the demographic growth of aboriginal populations.

Description:

In this paper, we assemble data from several household surveys to document how pension coverage of young and older workers has evolved in Canada between the mid-1980s and the mid-1990s. Our main findings are the following. First, both administrative data from the Pension Plans in Canada (PPIC) database and data from household surveys show an increase in RPP coverage for women. In contrast, while PPIC data show a decrease in coverage for men, household surveys indicate no downward trend for males. Second, sample aggregates hide interesting differences within the population. We find that the pension coverage of young workers (aged 25-34) has declined relative to older workers (aged 35-54). Young males have experienced a decline in coverage while RPP coverage has remained fairly stable for older men. In contrast, pension coverage has remained fairly constant for young women but has risen substantially for older women. Third, the decline in unionism and shifts towards industries with low-coverage explain most of the decrease in coverage observed among young men. Fourth, the growth in older women's coverage appears to be the result of their greater propensity to be employed in highly paid/highly covered occupations.

Description:

Series description

This series includes five general reference products - the Preview of Products and Services; the Catalogue; the Dictionary; the Handbook and the Technical Reports - as well as geography reference products - GeoSuite and Reference Maps.

Product description

Technical Reports examine the quality of data from the 1996 Census, a large and complex undertaking. While considerable effort was taken to ensure high quality standards throughout each step, the results are subject to a certain degree of error. Each report looks at the collection and processing operations and presents results from data evaluation, as well as notes on historical comparability.

Technical Reports are aimed at moderate and sophisticated users but are written in a manner which could make them useful to all census data users. Most of the technical reports have been cancelled, with the exception of Age, Sex, Marital Status and Common-law Status, Coverage and Sampling and Weighting. These reports will be available as bilingual publications as well as being available in both official languages on the Internet as free products.

This report deals with coverage errors, which occured when persons, households, dwellings or families were missed by the 1996 Census or enumerated in error. Coverage errors are one of the most important types of error since they affect not only the accuracy of the counts of the various census universes but also the accuracy of all of the census data describing the characteristics of these universes. With this information, users can determine the risks involved in basing conclusions or decisions on census data.

Description:

This report deals with sampling and weighting, a process whereby certain characteristics are collected and processed for a random sample of dwellings and persons identified in the complete census enumeration. Data for the whole population are then obtained by scaling up the results for the sample to the full population level. The use of sampling may lead to substantial reductions in costs and respondent burden, or alternatively, can allow the scope of a census to be broadened at the same cost.

Description:

Series Description:

This series includes five general reference products - the Preview of Products and Services; the Catalogue; the Dictionary; the Handbook and Technical Reports - as well as two geography reference products - GeoSuite and Reference Maps.

Product Description:

The 1996 Census Dictionary provides detailed information on all of the concepts, variables and geographic elements of the 1996 Census. Information provided for each variable includes a definition, the associated census questions, applicable response categories or classifications and special remarks, namely on historical aspects. Users should make use of this edition of the 1996 Census Dictionary for the most up-to-date information. This final edition is also available on our web site as a free downloadable product.

Description:

The National Population Health Survey (NPHS) is a family of surveys with multiple objectives, one of which is to provide information on a panel of people who will be followed over time to reflect the dynamic process of health and illness. Data for the first cycle of the NPHS - Households Survey were collected from June 1994 to June 1995, and were released in September 1995. Data for the second cycle were collected from June 1996 to August 1997. One of the primary outputs for the second cycle is a longitudinal master file. This paper will describe six major strategies that were developed to process the longitudinal master file.

Description:

In 1994, Statistics Canada introduced a new longitudinal social survey that collects information from about 23,000 children spread over 13,500 households. The objective of the National Longitudinal Survey of Children and Youth is to measure the development and well being of children until they reach adulthood. To this end, the survey gathers together information about the child, parents, neighbourhood as well as family and school environment. As a consequence, the data collected for each child, is provided by several respondents, from parents to teachers, a situation which contributes to an increased disclosure risk. In order to reach a balance between confidentiality and the analytical value of released data, the survey produces three different microdata files with more or less information. The master file that contains all the information is only available by means of remote access. Hence, researchers do not have direct access to the data, but send their request in the form of software programs that are submitted by Statistics Canada staff. The results are then vetted for confidentiality and sent back to the researchers. The presentation will be devoted to the various disclosure risks of such a survey and to the tools used to reduce those risks.

Description:

In epidemiology analysis of longitudinal data is commonly accepted as providing the most robust measures of association between putative risk and selected outcomes such as death or cancer. SMARTIE is a SAS application for efficient analysis of longitudinal data. Based on person days at risk, it can handle multiple exits from and re-entries to risk, and derives outcome measures such as survival rates. Standardised Mortality Ratios (SMRs) and Cancer Incidence Ratios (SIRs). Summary data can be produced in a format easily ported to any modelling package such as Stats 5.0. We discuss the background to its development, the overall program structure, its command language, and finally we say something about the organization of outputs. Findings from survival studies using the Longitudinal Study of the Office for National Statistics (ONS) are used to demonstrate features of SMARTIE. This study is based on one per cent of the population of England and Wales. It is continually updated with the addition of new members and with information from birth, death and cancer records, and from the census.

Description:

Models for fitting longitudinal binary responses are explored using a panel study of voting intentions. A standard repeated measures multilevel logistic model is shown inadequate due to the presence of a substantial proportion of respondents who maintain a constant response over time. A multivariate binary response model is shown a better fit to the data.

Description:

Longitudinal studies with repeated observations on individuals permit better characterizations of change and assessment of possible risk factors, but there has been little experience applying sophisticated models for longitudinal data to the complex survey setting. We present results from a comparison of different variance estimation methods for random effects models of change in cognitive function among older adults. The sample design is a stratified sample of people 65 and older, drawn as part of a community-based study designed to examine risk factors for dementia. The model summarizes the population heterogeneity in overall level and rate of change in cognitive function using random effects for intercept and slope. We discuss an unweighted regression including covariates for the stratification variables, a weighted regression, and bootstrapping; we also did preliminary work into using balanced repeated replication and jackknife repeated replication.

Description:

This paper presents a method for handling longitudinal data in which individuals belong to more than one unit at a higher level, and also where there is missing information on the identification of the units to which they belong. In education, for example, a student might be classified as belonging sequentially to a particular combination of primary and secondary school, but for some students, the identity of either the primary or secondary school may be unknown. Likewise, in a longitudinal study, students may change school or class from one period to the next, so 'belonging' to more than one higher level unit. The procedures used to model these stuctures are extensions of a random effects cross-classified multilevel model.

Description:

The British Labour Force Survey (LFS) is a quarterly household survey with a rotating sample design that can potentially be used to produce longitudinal data, including estimates of labour force gross flows. However, these estimates may be biased due to the effect of non-response. Weighting adjustments are a commonly used method to account for non-response bias. We find that weighting may not fully account for the effect of non-response bias because non-response may depend on the unobserved labour force flows, i.e., the non-response is non-ignorable. To adjust for the effects of non-ignorable non-response, we propose a model for the complex non-response patterns in the LFS which controls for the correlated within-household non-response behaviour found in the survey. The results of modelling suggest that non-response may be non-ignorable in the LFS, causing the weighting estimates to be biased.