Frequencies for first 10,000 rows of prov2385 variable in pos1991 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,880       68.80       68.80
          0 |      1,572       15.72       84.52
          1 |      1,124       11.24       95.76
          2 |         77        0.77       96.53
          3 |         64        0.64       97.17
          7 |        283        2.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016