Frequencies for first 10,000 rows of pt_srvc_cd variable in pos1994 dataset :

       srv: |
   physical |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,438       74.38       74.38
          0 |        282        2.82       77.20
          1 |      1,020       10.20       87.40
          2 |        971        9.71       97.11
          3 |        289        2.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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