Appendix A
Algebraic Notation

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1. Nonresponse adjustment

The subweight (i.e. the design weight adjusted for nonresponse) for a household k, denoted as , is

Description

where
s_g,r is the set of respondents in nonresponse group g,

s_g,nr is the set of nonrespondents (refusals, no contacts, unusable data) in nonresponse group g, and

is the design weight attributed to household k.

2. Calculation of the slippage rate

The slippage rate for a control group c, denoted as rate_c, is

Description

where
s_c,r is the set of respondents in control group c,

is the subweight of household k, and

t_c is the total of the auxiliary data for control group c.