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I want to compare the mobility of siblings in the PSID. How can I find siblings considering they no longer live in their family of origin?
The PSID has created a Family Identification and Mapping System (FIMS):
https://simba.isr.umich.edu/FIMS/ (Login Required)
It allows one to create identifiers for intra-generational samples (e.g., siblings) or inter-generational (individual to parent; individual to grandparent; individual to great grandparent).
One can also control the biological nature of the relationship, e.g., full siblings; half siblings, dad in common; etc.
PSID has also created several tutorials on how to create and analyze intergernational data in its tutorial center:
Here's a direct link to the most explicit tutorial: