Frequencies for first 10,000 rows of uld_precip variable in natlterr2007 dataset :

Precipitous |
  labor RFP |
718=f_uld_p |
  recip U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         75        0.75        0.75
          2 |      8,541       85.41       86.16
          9 |      1,384       13.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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