Frequencies for first 10,000 rows of precip variable in natlterr2002 dataset :

Precipitous |
  labor (<3 |
     hours) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         54        0.54        0.54
          2 |      9,924       99.24       99.78
          8 |         14        0.14       99.92
          9 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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