Frequencies for first 10,000 rows of scpwi23d variable in namcs2007 dataset :

scope write |
  in #2 - 3 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,993       99.93       99.93
        451 |          6        0.06       99.99
        863 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016