Frequencies for first 10,000 rows of prov2520 variable in pos2006 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,263       82.63       82.63
          0 |        318        3.18       85.81
          1 |        410        4.10       89.91
          2 |        690        6.90       96.81
          3 |        319        3.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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