Frequencies for first 10,000 rows of prov3500 variable in pos1999 dataset :

       srv: |
xray-onsite |
 -residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,387       73.87       73.87
          N |        451        4.51       78.38
          Y |      2,162       21.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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