Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos1996 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,165       81.65       81.65
          0 |        331        3.31       84.96
          1 |      1,036       10.36       95.32
          2 |        342        3.42       98.74
          3 |        126        1.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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