This variable is the amount of food stamps/SNAP benefits that a respondent received in month M of year Y. M goes from 1 to 12 and represents the calendar month. Y goes from 1 to 6 and represents the number calendar year for a given SIPP panel. The relevant SIPP variables are I27AMT1, I27AMT2, I27AMT3, I27AMT4 in the 1984 panel; S27AMT in the 1990, 1991, 1992, and 1993 panels; T27AMT in the 1996, 2001, 2004, and 2008 panels.