Frequencies for first 10,000 rows of patcode variable in namcs1994 dataset :

    patient |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        402        4.02        4.02
          2 |        402        4.02        8.04
          3 |        402        4.02       12.06
          4 |        401        4.01       16.07
          5 |        399        3.99       20.06
          6 |        397        3.97       24.03
          7 |        391        3.91       27.94
          8 |        384        3.84       31.78
          9 |        378        3.78       35.56
         10 |        370        3.70       39.26
         11 |        364        3.64       42.90
         12 |        360        3.60       46.50
         13 |        347        3.47       49.97
         14 |        342        3.42       53.39
         15 |        331        3.31       56.70
         16 |        320        3.20       59.90
         17 |        311        3.11       63.01
         18 |        301        3.01       66.02
         19 |        291        2.91       68.93
         20 |        276        2.76       71.69
         21 |        254        2.54       74.23
         22 |        238        2.38       76.61
         23 |        225        2.25       78.86
         24 |        210        2.10       80.96
         25 |        196        1.96       82.92
         26 |        180        1.80       84.72
         27 |        167        1.67       86.39
         28 |        149        1.49       87.88
         29 |        133        1.33       89.21
         30 |        123        1.23       90.44
         31 |        111        1.11       91.55
         32 |         93        0.93       92.48
         33 |         83        0.83       93.31
         34 |         77        0.77       94.08
         35 |         70        0.70       94.78
         36 |         60        0.60       95.38
         37 |         52        0.52       95.90
         38 |         47        0.47       96.37
         39 |         45        0.45       96.82
         40 |         40        0.40       97.22
         41 |         36        0.36       97.58
         42 |         32        0.32       97.90
         43 |         28        0.28       98.18
         44 |         25        0.25       98.43
         45 |         20        0.20       98.63
         46 |         16        0.16       98.79
         47 |         16        0.16       98.95
         48 |         14        0.14       99.09
         49 |         13        0.13       99.22
         50 |         11        0.11       99.33
         51 |          8        0.08       99.41
         52 |          8        0.08       99.49
         53 |          6        0.06       99.55
         54 |          5        0.05       99.60
         55 |          5        0.05       99.65
         56 |          5        0.05       99.70
         57 |          5        0.05       99.75
         58 |          4        0.04       99.79
         59 |          4        0.04       99.83
         60 |          4        0.04       99.87
         61 |          3        0.03       99.90
         62 |          3        0.03       99.93
         63 |          2        0.02       99.95
         64 |          1        0.01       99.96
         65 |          1        0.01       99.97
         66 |          1        0.01       99.98
         67 |          1        0.01       99.99
         68 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016