Frequencies for first 10,000 rows of rectype variable in natl1980 dataset :

Record type |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,522       75.22       75.22
          2 |      2,478       24.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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