Frequencies for first 10,000 rows of proc42d variable in namcs2010 dataset :

procedure 4 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,931       99.31       99.31
         00 |          1        0.01       99.32
         28 |          1        0.01       99.33
         37 |          1        0.01       99.34
         53 |          1        0.01       99.35
         89 |         22        0.22       99.57
         93 |          4        0.04       99.61
         95 |         37        0.37       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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