Frequencies for first 10,000 rows of mdcl_scl_srvc_cd variable in pos2000 dataset :

       srv: |
    medical |
     social |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,156       81.56       81.56
          0 |        271        2.71       84.27
          1 |      1,080       10.80       95.07
          2 |        357        3.57       98.64
          3 |        136        1.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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