Frequencies for first 10,000 rows of pt_srvc_cd variable in pos1992 dataset :

       srv: |
   physical |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,382       73.82       73.82
          0 |        298        2.98       76.80
          1 |      1,167       11.67       88.47
          2 |        931        9.31       97.78
          3 |        222        2.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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