Frequencies for first 10,000 rows of uld_precip variable in natl2004 dataset :

Precipitous |
  labor U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        385        3.85        3.85
          2 |      8,641       86.41       90.26
          9 |        974        9.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016