Data quality, concepts and methodology: Data collection and processing
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Responding to this survey is mandatory. Data were collected directly from survey respondents using mail out/mail back questionnaires.
Mail out occurred in August of the year following the reference year and was directed to an “environment manager or coordinator”. Respondents were asked to return the completed questionnaires within 30 days of receipt. Upon receipt, the collected questionnaires were scanned and the data from these questionnaires were captured using “key from image” technology. Preliminary editing was also performed to ensure the validity of the collected data. Follow-up for nonresponse and for data validation was conducted by telephone or fax. Fax reminders were sent to respondents whose questionnaires were outstanding 45 days after the mail out. Collection activities for the 2011 survey were completed in March 2013.
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