Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos2003 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,932       79.32       79.32
          0 |        306        3.06       82.38
          1 |      1,174       11.74       94.12
          2 |        347        3.47       97.59
          3 |        241        2.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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