Frequencies for first 10,000 rows of prov2500 variable in pos1993 dataset :

       srv: |
   physical |
therapy/spe |
   ech path |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,706       97.06       97.06
          1 |        124        1.24       98.30
          2 |         58        0.58       98.88
          3 |        110        1.10       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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