Frequencies for first 10,000 rows of pldel variable in natl1988 dataset :

   Place of |
   Delivery |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,956       99.56       99.56
          2 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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