Frequencies for first 10,000 rows of physn_srvc_onst_nrsdnt_sw variable in pos1993 dataset :

       srv: |
physician-o |
  nsite-non |
   resident |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,627       76.27       76.27
          N |      2,315       23.15       99.42
          Y |         58        0.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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