Frequencies for first 10,000 rows of prov1570 variable in pos2010 dataset :

PARTICIPATI |
ON MEDICARE |
     OPT/SP |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,860       98.60       98.60
          N |        136        1.36       99.96
          Y |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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