Frequencies for first 10,000 rows of mdcr_prtcptn_op_pt_spch_sw variable in pos2008 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 , 17 May 2017