Frequencies for first 10,000 rows of prov2520 variable in pos1993 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,870       88.70       88.70
          0 |        290        2.90       91.60
          1 |        299        2.99       94.59
          2 |        432        4.32       98.91
          3 |        109        1.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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