Frequencies for first 10,000 rows of prov3500 variable in pos1998 dataset :

       srv: |
xray-onsite |
 -residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,422       74.22       74.22
          N |        463        4.63       78.85
          Y |      2,115       21.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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