Frequencies for first 10,000 rows of uld_precip variable in linkpe2009psden dataset :

Precipitous |
  labor U;R |
(f_uld_prec |
     ip rep |
      flag) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         89        0.89        0.89
          2 |      9,859       98.59       99.48
          9 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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