Frequencies for first 10,000 rows of gestimp variable in natl1982 dataset :

  Gestation |
 Imputation |
       Flag |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,025       20.25       20.25
          . |      7,975       79.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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