Frequencies for first 10,000 rows of prov3490 variable in pos1993 dataset :

       srv: |
   clinical |
lab-onsite- |
    non res |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,627       76.27       76.27
          N |      2,329       23.29       99.56
          Y |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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