Frequencies for first 10,000 rows of precip variable in natlterr1996 dataset :

Precipitous |
      labor |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         37        0.37        0.37
          2 |      9,952       99.52       99.89
          9 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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