Frequencies for first 10,000 rows of precip variable in natl1997 dataset :

Precipitous |
      labor |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        130        1.30        1.30
          2 |      9,863       98.63       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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