Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos2009 dataset :

       SRV: |
    MEDICAL |
     SOCIAL |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,565       75.65       75.65
          0 |        315        3.15       78.80
          1 |      1,372       13.72       92.52
          2 |        542        5.42       97.94
          3 |        206        2.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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