Frequencies for first 10,000 rows of patcode variable in namcs2012 dataset :

 Sequential |
  numbering |
   of visit |
records per |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        480        4.80        4.80
          2 |        467        4.67        9.47
          3 |        457        4.57       14.04
          4 |        449        4.49       18.53
          5 |        438        4.38       22.91
          6 |        420        4.20       27.11
          7 |        412        4.12       31.23
          8 |        402        4.02       35.25
          9 |        392        3.92       39.17
         10 |        386        3.86       43.03
         11 |        366        3.66       46.69
         12 |        352        3.52       50.21
         13 |        333        3.33       53.54
         14 |        320        3.20       56.74
         15 |        310        3.10       59.84
         16 |        296        2.96       62.80
         17 |        285        2.85       65.65
         18 |        276        2.76       68.41
         19 |        265        2.65       71.06
         20 |        252        2.52       73.58
         21 |        229        2.29       75.87
         22 |        220        2.20       78.07
         23 |        213        2.13       80.20
         24 |        202        2.02       82.22
         25 |        195        1.95       84.17
         26 |        183        1.83       86.00
         27 |        168        1.68       87.68
         28 |        157        1.57       89.25
         29 |        146        1.46       90.71
         30 |        133        1.33       92.04
         31 |        113        1.13       93.17
         32 |        104        1.04       94.21
         33 |         94        0.94       95.15
         34 |         79        0.79       95.94
         35 |         73        0.73       96.67
         36 |         66        0.66       97.33
         37 |         61        0.61       97.94
         38 |         48        0.48       98.42
         39 |         38        0.38       98.80
         40 |         31        0.31       99.11
         41 |         23        0.23       99.34
         42 |         15        0.15       99.49
         43 |         11        0.11       99.60
         44 |          9        0.09       99.69
         45 |          5        0.05       99.74
         46 |          5        0.05       99.79
         47 |          5        0.05       99.84
         48 |          4        0.04       99.88
         49 |          4        0.04       99.92
         50 |          4        0.04       99.96
         51 |          2        0.02       99.98
         52 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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