Frequencies for first 10,000 rows of prov3520 variable in pos2003 dataset :

 srv: blood |
admin-onsit |
   e-nonres |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,305       73.05       73.05
          N |      2,664       26.64       99.69
          Y |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017