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The 1985 and 1986 SIPP Panels present a rare opportunity to study the effects of data collection mode in panel surveys on the stability of two important survey measures -- occupation and industry. The reason is that the 1986 panel used a question to determine whether occupation and industry questions should be asked in the next wave (i.e., dependent data collection mode), whereas the 1985 panel did not (i.e., independent data collection mode). If the respondent said no to this question then occupation and industry codes from the prior waves were carried forward to the current wave. Since these panels overlap in historical time and each is a probabilty sample of the same population (and since there is no evidence of panel conditioning), the combinded data represent a randomized experiment with the treatment being the use of the screening question. The outcome measures consist of the month-to-month gross change in occupation and industry of employment.
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