Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos2006 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,670       76.70       76.70
          0 |        314        3.14       79.84
          1 |      1,281       12.81       92.65
          2 |        446        4.46       97.11
          3 |        289        2.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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