Frequencies for first 10,000 rows of pldel variable in natl1985 dataset :

   Place of |
   Delivery |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,937       99.37       99.37
          2 |         62        0.62       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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