Frequencies for first 10,000 rows of hemo variable in linkco1991us_num dataset :

Hemoglobino |
      pathy |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          5        0.05        0.05
          2 |      9,707       97.07       97.12
          8 |          9        0.09       97.21
          9 |        279        2.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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