Frequencies for first 10,000 rows of proc33d variable in namcs2011 dataset : Procedure 3 | - 3 digit | Freq. Percent Cum. ------------+----------------------------------- -9 | 9,621 96.21 96.21 174 | 1 0.01 96.22 220 | 1 0.01 96.23 388 | 1 0.01 96.24 436 | 1 0.01 96.25 446 | 1 0.01 96.26 451 | 1 0.01 96.27 452 | 1 0.01 96.28 462 | 1 0.01 96.29 470 | 1 0.01 96.30 483 | 1 0.01 96.31 494 | 1 0.01 96.32 789 | 1 0.01 96.33 819 | 2 0.02 96.35 861 | 3 0.03 96.38 863 | 3 0.03 96.41 877 | 1 0.01 96.42 881 | 1 0.01 96.43 882 | 1 0.01 96.44 891 | 11 0.11 96.55 892 | 1 0.01 96.56 893 | 148 1.48 98.04 894 | 1 0.01 98.05 895 | 39 0.39 98.44 897 | 11 0.11 98.55 903 | 4 0.04 98.59 905 | 5 0.05 98.64 909 | 7 0.07 98.71 919 | 1 0.01 98.72 933 | 17 0.17 98.89 939 | 2 0.02 98.91 940 | 3 0.03 98.94 950 | 76 0.76 99.70 954 | 6 0.06 99.76 992 | 14 0.14 99.90 993 | 1 0.01 99.91 995 | 6 0.06 99.97 999 | 3 0.03 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016