Frequencies for first 10,000 rows of pt_srvc_cd variable in pos2012 dataset :

   Services |
  Provided: |
   Physical |
    Therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      5,924       59.24       59.24
          0 |        365        3.65       62.89
          1 |      1,989       19.89       82.78
          2 |      1,345       13.45       96.23
          3 |        377        3.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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