Frequencies for first 10,000 rows of prov3505 variable in pos2007 dataset :

       srv: |
xray-onsite |
       -non |
  residents |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,522       75.22       75.22
          N |      2,425       24.25       99.47
          Y |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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