Frequencies for first 10,000 rows of proc52d variable in namcs2011 dataset :

Procedure 5 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,948       99.48       99.48
         17 |          1        0.01       99.49
         28 |          1        0.01       99.50
         49 |          1        0.01       99.51
         65 |          1        0.01       99.52
         89 |         36        0.36       99.88
         90 |          2        0.02       99.90
         92 |          3        0.03       99.93
         95 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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