Frequencies for first 10,000 rows of proc32d variable in namcs2012 dataset :

Procedure 3 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,801       98.01       98.01
         12 |          4        0.04       98.05
         16 |          2        0.02       98.07
         17 |          1        0.01       98.08
         20 |          1        0.01       98.09
         22 |          1        0.01       98.10
         28 |          1        0.01       98.11
         38 |          2        0.02       98.13
         39 |          8        0.08       98.21
         40 |          1        0.01       98.22
         43 |          1        0.01       98.23
         45 |          2        0.02       98.25
         48 |          2        0.02       98.27
         49 |          1        0.01       98.28
         53 |          1        0.01       98.29
         57 |          1        0.01       98.30
         59 |          2        0.02       98.32
         67 |          1        0.01       98.33
         68 |          1        0.01       98.34
         80 |          3        0.03       98.37
         81 |          6        0.06       98.43
         85 |          2        0.02       98.45
         86 |          5        0.05       98.50
         87 |          1        0.01       98.51
         88 |          4        0.04       98.55
         89 |         43        0.43       98.98
         90 |         34        0.34       99.32
         91 |          7        0.07       99.39
         93 |          1        0.01       99.40
         94 |          7        0.07       99.47
         95 |         15        0.15       99.62
         96 |          5        0.05       99.67
         99 |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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