Frequencies for first 10,000 rows of uld_precip variable in natl2003 dataset :

Precipitous |
  labor U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        316        3.16        3.16
          2 |      8,844       88.44       91.60
          8 |          5        0.05       91.65
          9 |        835        8.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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