Frequencies for first 10,000 rows of precip variable in natl2002 dataset :

Precipitous |
  labor (<3 |
     hours) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        367        3.67        3.67
          2 |      9,334       93.34       97.01
          9 |        299        2.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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