I would like to create a time series of college enrollment rates from the IPUMS-CPS using SCHLCOLL and the monthly data from 1989 to 2010.
I understand from the documenation that “The March CPS files include two groups of people who are not included in the production of published labor force statistics: (1) members of the armed services, and (2) members of the Hispanic oversample who were interviewed in months other than March. WTFINL and EARNWT assign these groups a value of 0. Both groups are assigned non-zero values in WTSUPP.”
So if I would like to compare the enrollment rate from say, February 2000 to March 2000, how do I exclude from the March sample (1) members of the armed services, and (2) members of the Hispanic oversample so that the enrollment rate is representative of the same universe? In other words, is there a way to create a March version of WTFINL so that March and the other months have the same sampling universe?
Thank you very much for your assistance.