Frequencies for first 10,000 rows of prov2520 variable in pos2004 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,384       83.84       83.84
          0 |        281        2.81       86.65
          1 |        391        3.91       90.56
          2 |        614        6.14       96.70
          3 |        330        3.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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