Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos1995 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,463       84.63       84.63
          0 |        322        3.22       87.85
          1 |        777        7.77       95.62
          2 |        313        3.13       98.75
          3 |        125        1.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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