How do you calculate the income as a percentage of the federal poverty level? What variables are required to calculate this value?
I am assuming you are referring to the data available in IPUMS CPS in this question. Please let me know if I am incorrect. This page on the IPUMS CPS website provides detailed information about replicating official poverty rates. In particular, this page discusses each of the variables you’ll need to replicate official poverty rate estimates. It also provides a discussion about the methodological choices used by the “official” Census Bureau poverty rate estimates and to other estimates using alternative methodologies.