Frequencies for first 10,000 rows of mdcr_prtcptn_op_pt_spch_sw variable in pos1991 dataset :

participati |
on medicare |
     opt/sp |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,965       99.65       99.65
          N |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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