To create this data set, I copied data_necma.dta and entered the following three commands: keep if year==1990 , drop if msa==. , and keep msa msaname population
December 7, 2006: I added six population size variables (pop1-pop6) based on 1990 population. I created them in SAS with program x:\Jerry\Tourism Paper\pop dummies.sas; all relevant documentation is contained in that program. K. Buzard