Frequencies for first 10,000 rows of gestimp variable in natl1986 dataset :

  Gestation |
 Imputation |
       Flag |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,960       19.60       19.60
          . |      8,040       80.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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