Frequencies for first 10,000 rows of gest_imp variable in natl2007 dataset :

  Gestation |
    Imputed |
   Flag U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         74        0.74        0.74
          . |      9,926       99.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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