Frequencies for first 10,000 rows of pt_srvc_cd variable in pos1995 dataset :

       srv: |
   physical |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,349       73.49       73.49
          0 |        276        2.76       76.25
          1 |      1,012       10.12       86.37
          2 |      1,039       10.39       96.76
          3 |        324        3.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017