Frequencies for first 10,000 rows of prov2520 variable in pos1994 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,780       87.80       87.80
          0 |        297        2.97       90.77
          1 |        302        3.02       93.79
          2 |        470        4.70       98.49
          3 |        151        1.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017