Frequencies for first 10,000 rows of f_mm_mtrans variable in natl2010 dataset :

   Maternal |
Transfusion |
(mm_mtrans) |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,983       99.83       99.83
          1 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015