Frequencies for first 10,000 rows of prov3490 variable in pos1992 dataset :

       srv: |
   clinical |
lab-onsite- |
    non res |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,366       73.66       73.66
          N |      2,581       25.81       99.47
          Y |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016