Frequencies for first 10,000 rows of hematocr variable in namcs2002 dataset :

Hematocrit/ |
 hemoglobin |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,782       97.82       97.82
        Yes |        218        2.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016