Frequencies for first 10,000 rows of patcode variable in namcs1997 dataset :

    patient |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        965        9.65        9.65
          2 |        915        9.15       18.80
          3 |        853        8.53       27.33
          4 |        800        8.00       35.33
          5 |        745        7.45       42.78
          6 |        688        6.88       49.66
          7 |        620        6.20       55.86
          8 |        559        5.59       61.45
          9 |        489        4.89       66.34
         10 |        445        4.45       70.79
         11 |        392        3.92       74.71
         12 |        364        3.64       78.35
         13 |        321        3.21       81.56
         14 |        278        2.78       84.34
         15 |        237        2.37       86.71
         16 |        206        2.06       88.77
         17 |        179        1.79       90.56
         18 |        154        1.54       92.10
         19 |        129        1.29       93.39
         20 |        101        1.01       94.40
         21 |         89        0.89       95.29
         22 |         79        0.79       96.08
         23 |         67        0.67       96.75
         24 |         56        0.56       97.31
         25 |         41        0.41       97.72
         26 |         38        0.38       98.10
         27 |         31        0.31       98.41
         28 |         29        0.29       98.70
         29 |         19        0.19       98.89
         30 |         17        0.17       99.06
         31 |         15        0.15       99.21
         32 |         13        0.13       99.34
         33 |         11        0.11       99.45
         34 |          8        0.08       99.53
         35 |          6        0.06       99.59
         36 |          5        0.05       99.64
         37 |          5        0.05       99.69
         38 |          4        0.04       99.73
         39 |          4        0.04       99.77
         40 |          4        0.04       99.81
         41 |          3        0.03       99.84
         42 |          3        0.03       99.87
         43 |          3        0.03       99.90
         44 |          2        0.02       99.92
         45 |          2        0.02       99.94
         46 |          1        0.01       99.95
         47 |          1        0.01       99.96
         48 |          1        0.01       99.97
         49 |          1        0.01       99.98
         50 |          1        0.01       99.99
         51 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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