Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos2007 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,582       75.82       75.82
          0 |        308        3.08       78.90
          1 |      1,323       13.23       92.13
          2 |        514        5.14       97.27
          3 |        273        2.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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