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Q:  

The PSID changed their sample in 1997 - reduced the number of original families that are included in the survey. How does this affect the weights?

A:  

There is a document on the PSID website that provides an [explanation of how the weights were recalibrated:

http://psidonline.isr.umich.edu/data/Documentation/wts97.pdf.

The source for this answer is from the PSID FAQ area (#32):

http://psidonline.isr.umich.edu/Guide/FAQ.aspx.

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