Frequencies for first 10,000 rows of precip variable in natl1998 dataset :

Precipitous |
      labor |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        127        1.27        1.27
          2 |      9,872       98.72       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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