Frequencies for first 10,000 rows of prov3525 variable in pos2009 dataset :

 SRV: BLOOD |
ADMIN-OFFSI |
TE-RESIDENT |
          S |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,657       76.57       76.57
          N |      2,102       21.02       97.59
          Y |        241        2.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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