Sample attrition is a potential source of selection bias in experimental as well as non-experimental programme evaluation. For labour market outcomes such as employment status and earnings, missing data problems caused by attrition can be circumvented by collection of follow-up data from administrative regiters. For most non labour market outcomes however, investigators must rely on participants willingness to cooperate in keeping detailed follow-up records and statistical correction procedures to identify and possibly adjust for attrition bias.
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Length: 28 pages Date of creation: 2000 Date of revision: Handle: RePEc:fth:bereco:0101
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