Frequencies for first 10,000 rows of amb22d variable in nhamcsopd1992 dataset :

     amb22d |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,892       98.92       98.92
         08 |          2        0.02       98.94
         13 |         29        0.29       99.23
         20 |          1        0.01       99.24
         28 |          1        0.01       99.25
         31 |          1        0.01       99.26
         33 |          1        0.01       99.27
         42 |          5        0.05       99.32
         44 |          3        0.03       99.35
         45 |          8        0.08       99.43
         49 |          1        0.01       99.44
         53 |          4        0.04       99.48
         54 |          2        0.02       99.50
         58 |          1        0.01       99.51
         65 |          4        0.04       99.55
         67 |         12        0.12       99.67
         68 |          2        0.02       99.69
         69 |          3        0.03       99.72
         70 |          4        0.04       99.76
         78 |          2        0.02       99.78
         80 |          2        0.02       99.80
         81 |          1        0.01       99.81
         82 |          2        0.02       99.83
         85 |          2        0.02       99.85
         86 |          8        0.08       99.93
         93 |          5        0.05       99.98
         96 |          1        0.01       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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