Frequencies for first 10,000 rows of prov2520 variable in pos2007 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,195       81.95       81.95
          0 |        333        3.33       85.28
          1 |        421        4.21       89.49
          2 |        759        7.59       97.08
          3 |        292        2.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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