Frequencies for first 10,000 rows of p4 variable in miper dataset :

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,498       74.98       74.98
          1 |         36        0.36       75.34
          2 |         63        0.63       75.97
          3 |         48        0.48       76.45
          4 |         67        0.67       77.12
          5 |         66        0.66       77.78
          6 |         52        0.52       78.30
          7 |         58        0.58       78.88
          8 |         68        0.68       79.56
          9 |         75        0.75       80.31
         10 |         69        0.69       81.00
         11 |         93        0.93       81.93
         12 |         83        0.83       82.76
         13 |         86        0.86       83.62
         14 |        118        1.18       84.80
         15 |         97        0.97       85.77
         16 |        124        1.24       87.01
         17 |        106        1.06       88.07
         18 |        118        1.18       89.25
         19 |        125        1.25       90.50
         20 |         96        0.96       91.46
         21 |        109        1.09       92.55
         22 |         94        0.94       93.49
         23 |         89        0.89       94.38
         24 |         74        0.74       95.12
         25 |         80        0.80       95.92
         26 |         49        0.49       96.41
         27 |         56        0.56       96.97
         28 |         54        0.54       97.51
         29 |         44        0.44       97.95
         30 |         36        0.36       98.31
         31 |         28        0.28       98.59
         32 |         28        0.28       98.87
         33 |         16        0.16       99.03
         34 |         21        0.21       99.24
         35 |         15        0.15       99.39
         36 |         11        0.11       99.50
         37 |          9        0.09       99.59
         38 |          7        0.07       99.66
         39 |          9        0.09       99.75
         40 |          3        0.03       99.78
         41 |          4        0.04       99.82
         42 |          2        0.02       99.84
         43 |          1        0.01       99.85
         44 |          1        0.01       99.86
         45 |          3        0.03       99.89
         46 |          1        0.01       99.90
         47 |          2        0.02       99.92
         48 |          1        0.01       99.93
         51 |          2        0.02       99.95
         54 |          1        0.01       99.96
         58 |          1        0.01       99.97
         60 |          1        0.01       99.98
         62 |          1        0.01       99.99
         66 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016