Frequencies for first 10,000 rows of prov2520 variable in pos2008 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,105       81.05       81.05
          0 |        343        3.43       84.48
          1 |        439        4.39       88.87
          2 |        848        8.48       97.35
          3 |        265        2.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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