Frequencies for first 10,000 rows of prov3520 variable in pos2001 dataset :

 srv: blood |
admin-onsit |
   e-nonres |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,345       73.45       73.45
          N |      2,626       26.26       99.71
          Y |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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