Frequencies for first 10,000 rows of prov2520 variable in pos2003 dataset :

srv: speech |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,428       84.28       84.28
          0 |        271        2.71       86.99
          1 |        377        3.77       90.76
          2 |        604        6.04       96.80
          3 |        320        3.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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