Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos2005 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,753       77.53       77.53
          0 |        316        3.16       80.69
          1 |      1,245       12.45       93.14
          2 |        404        4.04       97.18
          3 |        282        2.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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