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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,417       74.17       74.17
          1 |         28        0.28       74.45
          2 |         64        0.64       75.09
          3 |         57        0.57       75.66
          4 |         45        0.45       76.11
          5 |         56        0.56       76.67
          6 |         91        0.91       77.58
          7 |         64        0.64       78.22
          8 |         86        0.86       79.08
          9 |         81        0.81       79.89
         10 |        119        1.19       81.08
         11 |        106        1.06       82.14
         12 |        104        1.04       83.18
         13 |        102        1.02       84.20
         14 |        110        1.10       85.30
         15 |         95        0.95       86.25
         16 |        105        1.05       87.30
         17 |        113        1.13       88.43
         18 |        113        1.13       89.56
         19 |        104        1.04       90.60
         20 |        113        1.13       91.73
         21 |        124        1.24       92.97
         22 |         96        0.96       93.93
         23 |         89        0.89       94.82
         24 |         58        0.58       95.40
         25 |         60        0.60       96.00
         26 |         42        0.42       96.42
         27 |         59        0.59       97.01
         28 |         49        0.49       97.50
         29 |         29        0.29       97.79
         30 |         46        0.46       98.25
         31 |         28        0.28       98.53
         32 |         24        0.24       98.77
         33 |         22        0.22       98.99
         34 |         17        0.17       99.16
         35 |         16        0.16       99.32
         36 |         13        0.13       99.45
         37 |         10        0.10       99.55
         38 |         11        0.11       99.66
         39 |          5        0.05       99.71
         40 |          7        0.07       99.78
         41 |          2        0.02       99.80
         42 |          6        0.06       99.86
         43 |          6        0.06       99.92
         44 |          1        0.01       99.93
         45 |          1        0.01       99.94
         51 |          1        0.01       99.95
         52 |          1        0.01       99.96
         55 |          1        0.01       99.97
         58 |          1        0.01       99.98
         71 |          1        0.01       99.99
         72 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016