Frequencies for first 10,000 rows of prov2520 variable in pos1995 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,740       87.40       87.40
          0 |        285        2.85       90.25
          1 |        309        3.09       93.34
          2 |        496        4.96       98.30
          3 |        170        1.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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