Frequencies for first 10,000 rows of rectype variable in natl1977 dataset :

Record type |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,768       77.68       77.68
          2 |      2,232       22.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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