Frequencies for first 10,000 rows of proc4 variable in nhamcsopd2009 dataset : procedure 4 | Freq. Percent Cum. ------------+----------------------------------- -9 | 9,939 99.39 99.39 3323 | 1 0.01 99.40 4516 | 1 0.01 99.41 4542 | 2 0.02 99.43 4823 | 1 0.01 99.44 4921 | 1 0.01 99.45 598- | 1 0.01 99.46 6639 | 1 0.01 99.47 8628 | 1 0.01 99.48 8914 | 2 0.02 99.50 8915 | 3 0.03 99.53 8917 | 6 0.06 99.59 8938 | 13 0.13 99.72 8939 | 1 0.01 99.73 9199 | 1 0.01 99.74 9308 | 2 0.02 99.76 9319 | 1 0.01 99.77 9322 | 2 0.02 99.79 9339 | 1 0.01 99.80 9342 | 1 0.01 99.81 9383 | 1 0.01 99.82 9389 | 4 0.04 99.86 9390 | 8 0.08 99.94 9522 | 3 0.03 99.97 9547 | 1 0.01 99.98 9671 | 1 0.01 99.99 9939 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016