Frequencies for first 10,000 rows of prov2520 variable in pos2002 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,505       85.05       85.05
          0 |        262        2.62       87.67
          1 |        361        3.61       91.28
          2 |        609        6.09       97.37
          3 |        263        2.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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