Frequencies for first 10,000 rows of scpwi22d variable in nhamcsopd2008 dataset :

scope write |
  in #2 - 2 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,976       99.76       99.76
         21 |          2        0.02       99.78
         31 |          1        0.01       99.79
         33 |          1        0.01       99.80
         45 |         17        0.17       99.97
         48 |          1        0.01       99.98
         54 |          1        0.01       99.99
         56 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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