Frequencies for first 10,000 rows of datayear variable in natl1999 dataset :

  Data year |      Freq.     Percent        Cum.
------------+-----------------------------------
       1999 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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