Frequencies for first 10,000 rows of precip variable in natl1990 dataset :

Precipitous |
      labor |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        118        1.18        1.18
          2 |      9,816       98.16       99.34
          9 |         66        0.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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