Frequencies for first 10,000 rows of scopewi2 variable in nhamcsopd2007 dataset :

scope write |
      in #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,986       99.86       99.86
       2121 |          1        0.01       99.87
       4413 |          1        0.01       99.88
       4513 |          3        0.03       99.91
       4523 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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