Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos2008 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,476       74.76       74.76
          0 |        308        3.08       77.84
          1 |      1,360       13.60       91.44
          2 |        603        6.03       97.47
          3 |        253        2.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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