Frequencies for first 10,000 rows of prov2520 variable in pos1998 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,591       85.91       85.91
          0 |        259        2.59       88.50
          1 |        299        2.99       91.49
          2 |        639        6.39       97.88
          3 |        212        2.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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