Frequencies for first 10,000 rows of proc33d variable in namcs2012 dataset : Procedure 3 | - 3 digit | Freq. Percent Cum. ------------+----------------------------------- -9 | 9,801 98.01 98.01 122 | 4 0.04 98.05 162 | 2 0.02 98.07 173 | 1 0.01 98.08 200 | 1 0.01 98.09 221 | 1 0.01 98.10 282 | 1 0.01 98.11 389 | 2 0.02 98.13 394 | 1 0.01 98.14 395 | 6 0.06 98.20 399 | 1 0.01 98.21 409 | 1 0.01 98.22 438 | 1 0.01 98.23 451 | 2 0.02 98.25 483 | 2 0.02 98.27 492 | 1 0.01 98.28 539 | 1 0.01 98.29 573 | 1 0.01 98.30 597 | 1 0.01 98.31 598 | 1 0.01 98.32 673 | 1 0.01 98.33 681 | 1 0.01 98.34 802 | 1 0.01 98.35 804 | 1 0.01 98.36 808 | 1 0.01 98.37 819 | 6 0.06 98.43 852 | 1 0.01 98.44 856 | 1 0.01 98.45 861 | 1 0.01 98.46 862 | 1 0.01 98.47 863 | 1 0.01 98.48 868 | 2 0.02 98.50 876 | 1 0.01 98.51 882 | 1 0.01 98.52 889 | 3 0.03 98.55 890 | 18 0.18 98.73 892 | 2 0.02 98.75 893 | 20 0.20 98.95 895 | 2 0.02 98.97 896 | 1 0.01 98.98 903 | 3 0.03 99.01 905 | 19 0.19 99.20 909 | 12 0.12 99.32 913 | 5 0.05 99.37 914 | 2 0.02 99.39 935 | 1 0.01 99.40 940 | 5 0.05 99.45 944 | 2 0.02 99.47 950 | 9 0.09 99.56 951 | 1 0.01 99.57 954 | 5 0.05 99.62 964 | 2 0.02 99.64 965 | 3 0.03 99.67 992 | 8 0.08 99.75 993 | 2 0.02 99.77 994 | 6 0.06 99.83 995 | 13 0.13 99.96 999 | 4 0.04 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016