Frequencies for first 10,000 rows of patcode variable in namcs2008 dataset :

    patient |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        373        3.73        3.73
          2 |        373        3.73        7.46
          3 |        370        3.70       11.16
          4 |        370        3.70       14.86
          5 |        369        3.69       18.55
          6 |        367        3.67       22.22
          7 |        366        3.66       25.88
          8 |        363        3.63       29.51
          9 |        360        3.60       33.11
         10 |        352        3.52       36.63
         11 |        343        3.43       40.06
         12 |        339        3.39       43.45
         13 |        333        3.33       46.78
         14 |        326        3.26       50.04
         15 |        323        3.23       53.27
         16 |        313        3.13       56.40
         17 |        308        3.08       59.48
         18 |        302        3.02       62.50
         19 |        295        2.95       65.45
         20 |        284        2.84       68.29
         21 |        264        2.64       70.93
         22 |        253        2.53       73.46
         23 |        246        2.46       75.92
         24 |        235        2.35       78.27
         25 |        228        2.28       80.55
         26 |        210        2.10       82.65
         27 |        195        1.95       84.60
         28 |        175        1.75       86.35
         29 |        162        1.62       87.97
         30 |        151        1.51       89.48
         31 |        135        1.35       90.83
         32 |        121        1.21       92.04
         33 |        105        1.05       93.09
         34 |         96        0.96       94.05
         35 |         86        0.86       94.91
         36 |         70        0.70       95.61
         37 |         57        0.57       96.18
         38 |         50        0.50       96.68
         39 |         44        0.44       97.12
         40 |         39        0.39       97.51
         41 |         32        0.32       97.83
         42 |         25        0.25       98.08
         43 |         22        0.22       98.30
         44 |         20        0.20       98.50
         45 |         15        0.15       98.65
         46 |         12        0.12       98.77
         47 |         11        0.11       98.88
         48 |         10        0.10       98.98
         49 |         10        0.10       99.08
         50 |          9        0.09       99.17
         51 |          8        0.08       99.25
         52 |          7        0.07       99.32
         53 |          7        0.07       99.39
         54 |          7        0.07       99.46
         55 |          7        0.07       99.53
         56 |          6        0.06       99.59
         57 |          6        0.06       99.65
         58 |          6        0.06       99.71
         59 |          4        0.04       99.75
         60 |          4        0.04       99.79
         61 |          4        0.04       99.83
         62 |          3        0.03       99.86
         63 |          2        0.02       99.88
         64 |          1        0.01       99.89
         65 |          1        0.01       99.90
         66 |          1        0.01       99.91
         67 |          1        0.01       99.92
         68 |          1        0.01       99.93
         69 |          1        0.01       99.94
         70 |          1        0.01       99.95
         71 |          1        0.01       99.96
         72 |          1        0.01       99.97
         73 |          1        0.01       99.98
         74 |          1        0.01       99.99
         75 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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