Frequencies for first 10,000 rows of digsc22d variable in namcs2001 dataset :

diag/screen |
    service |
write-in #2 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,866       98.66       98.66
         20 |          1        0.01       98.67
         75 |          4        0.04       98.71
         87 |          1        0.01       98.72
         88 |         21        0.21       98.93
         89 |         53        0.53       99.46
         90 |          6        0.06       99.52
         92 |          1        0.01       99.53
         93 |         25        0.25       99.78
         95 |         16        0.16       99.94
         96 |          2        0.02       99.96
         99 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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