Dear Stata Listserv,
I’m seeking help with how to lag variables in a three-level mixed effects model using the mixed command. Level 1 is individuals, level 2 is the country-year, and level 3 is the country.
Before my current project, I was working with country-year (pooled time-series) data, using the mixed command. With these data, it was a simple matter to xtset the data <xtset country year> and then use the L. operator to lag any time-varying variables. More recently, however, I merged in individual-level data from the World Values Survey into this existing country-year dataset. So the basic unit of analysis is now the individual person (nested within survey years, nested within countries). With the individual-level data merged in, Stata (version 15) is no longer allowing me to xtset the data, so I can’t use the L. operator. However, I still want to lag my country-level time-varying variables by one year or more. How can I do that?
Thanks a lot,
Louisa
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