Frequencies for first 10,000 rows of proc4 variable in namcs2009 dataset : procedure 4 | - 4 digit | Freq. Percent Cum. ------------+----------------------------------- -9 | 9,920 99.20 99.20 0449 | 3 0.03 99.23 0481 | 1 0.01 99.24 8179 | 1 0.01 99.25 8199 | 1 0.01 99.26 8913 | 7 0.07 99.33 8918 | 1 0.01 99.34 8937 | 1 0.01 99.35 8938 | 15 0.15 99.50 8939 | 2 0.02 99.52 8950 | 1 0.01 99.53 8959 | 31 0.31 99.84 9039 | 1 0.01 99.85 9309 | 1 0.01 99.86 9359 | 1 0.01 99.87 9367 | 1 0.01 99.88 9411 | 1 0.01 99.89 9509 | 3 0.03 99.92 9651 | 1 0.01 99.93 9924 | 1 0.01 99.94 9941 | 1 0.01 99.95 9946 | 1 0.01 99.96 9947 | 2 0.02 99.98 9955 | 1 0.01 99.99 9959 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016