Frequencies for first 10,000 rows of prov3520 variable in pos1993 dataset :

 srv: blood |
admin-onsit |
   e-nonres |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,627       76.27       76.27
          N |      2,347       23.47       99.74
          Y |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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