Frequencies for first 10,000 rows of prov2520 variable in pos1996 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,548       85.48       85.48
          0 |        302        3.02       88.50
          1 |        332        3.32       91.82
          2 |        619        6.19       98.01
          3 |        199        1.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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