Frequencies for first 10,000 rows of prov3525 variable in pos2010 dataset :

 SRV: BLOOD |
ADMIN-OFFSI |
TE-RESIDENT |
          S |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,641       76.41       76.41
          N |      2,110       21.10       97.51
          Y |        249        2.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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