Frequencies for first 10,000 rows of prov1820 variable in pos1994 dataset : resident | program | approved by | other | Freq. Percent Cum. ------------+----------------------------------- | 8,940 89.40 89.40 N | 973 9.73 99.13 Y | 87 0.87 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 26 Jan 2016