Frequencies for first 10,000 rows of prov0015 variable in pos1991 dataset : acute/respi | te care | indicator | Freq. Percent Cum. ------------+----------------------------------- | 9,831 98.31 98.31 1 | 1 0.01 98.32 2 | 1 0.01 98.33 A | 30 0.30 98.63 B | 27 0.27 98.90 C | 110 1.10 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 26 Jan 2016