Frequencies for first 10,000 rows of prov2500 variable in pos1991 dataset :

       srv: |
   physical |
therapy/spe |
   ech path |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,702       97.02       97.02
          0 |          1        0.01       97.03
          1 |        129        1.29       98.32
          2 |         61        0.61       98.93
          3 |        106        1.06       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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