Frequencies for first 10,000 rows of prov2520 variable in pos1991 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,733       87.33       87.33
          0 |        324        3.24       90.57
          1 |        423        4.23       94.80
          2 |        490        4.90       99.70
          3 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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