Frequencies for first 10,000 rows of uld_precip variable in natlterr2005 dataset :

Precipitous |
  labor U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         98        0.98        0.98
          2 |      8,136       81.36       82.34
          9 |      1,766       17.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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