Frequencies for first 10,000 rows of gest_imp variable in natl2008 dataset :

  Gestation |
    Imputed |
   Flag U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,238       12.38       12.38
          . |      8,762       87.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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