Frequencies for first 10,000 rows of prov2520 variable in pos2000 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,590       85.90       85.90
          0 |        233        2.33       88.23
          1 |        333        3.33       91.56
          2 |        627        6.27       97.83
          3 |        217        2.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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