Frequencies for first 10,000 rows of gestimp variable in natl1983 dataset :

  Gestation |
 Imputation |
       Flag |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,091       20.91       20.91
          . |      7,909       79.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016