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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,512       75.12       75.12
          1 |         46        0.46       75.58
          2 |         56        0.56       76.14
          3 |         45        0.45       76.59
          4 |         53        0.53       77.12
          5 |         42        0.42       77.54
          6 |         58        0.58       78.12
          7 |         61        0.61       78.73
          8 |         84        0.84       79.57
          9 |         88        0.88       80.45
         10 |        110        1.10       81.55
         11 |         94        0.94       82.49
         12 |         82        0.82       83.31
         13 |        120        1.20       84.51
         14 |        123        1.23       85.74
         15 |        107        1.07       86.81
         16 |        135        1.35       88.16
         17 |        101        1.01       89.17
         18 |        112        1.12       90.29
         19 |        111        1.11       91.40
         20 |        118        1.18       92.58
         21 |         93        0.93       93.51
         22 |         75        0.75       94.26
         23 |         57        0.57       94.83
         24 |         79        0.79       95.62
         25 |         59        0.59       96.21
         26 |         46        0.46       96.67
         27 |         40        0.40       97.07
         28 |         46        0.46       97.53
         29 |         30        0.30       97.83
         30 |         34        0.34       98.17
         31 |         28        0.28       98.45
         32 |         27        0.27       98.72
         33 |         19        0.19       98.91
         34 |         14        0.14       99.05
         35 |         17        0.17       99.22
         36 |         14        0.14       99.36
         37 |          6        0.06       99.42
         38 |          5        0.05       99.47
         39 |          7        0.07       99.54
         40 |         15        0.15       99.69
         41 |          3        0.03       99.72
         42 |          5        0.05       99.77
         43 |          3        0.03       99.80
         44 |          2        0.02       99.82
         45 |          3        0.03       99.85
         46 |          1        0.01       99.86
         47 |          3        0.03       99.89
         48 |          2        0.02       99.91
         50 |          2        0.02       99.93
         53 |          3        0.03       99.96
         60 |          1        0.01       99.97
         64 |          2        0.02       99.99
         65 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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