Frequencies for first 10,000 rows of prov2520 variable in pos2001 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,570       85.70       85.70
          0 |        242        2.42       88.12
          1 |        337        3.37       91.49
          2 |        630        6.30       97.79
          3 |        221        2.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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