Frequencies for first 10,000 rows of prov2325 variable in pos2009 dataset :

       SRV: |
ORTHOTIC/PR |
   OSTHETIC |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,860       98.60       98.60
          0 |        114        1.14       99.74
          1 |         10        0.10       99.84
          2 |          7        0.07       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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