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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,383       73.83       73.83
          1 |         45        0.45       74.28
          2 |         61        0.61       74.89
          3 |         65        0.65       75.54
          4 |         64        0.64       76.18
          5 |         68        0.68       76.86
          6 |         70        0.70       77.56
          7 |         79        0.79       78.35
          8 |         88        0.88       79.23
          9 |         98        0.98       80.21
         10 |        104        1.04       81.25
         11 |        101        1.01       82.26
         12 |         70        0.70       82.96
         13 |        103        1.03       83.99
         14 |        133        1.33       85.32
         15 |        103        1.03       86.35
         16 |        125        1.25       87.60
         17 |        105        1.05       88.65
         18 |        123        1.23       89.88
         19 |        122        1.22       91.10
         20 |         99        0.99       92.09
         21 |        102        1.02       93.11
         22 |         90        0.90       94.01
         23 |         80        0.80       94.81
         24 |         78        0.78       95.59
         25 |         66        0.66       96.25
         26 |         68        0.68       96.93
         27 |         46        0.46       97.39
         28 |         39        0.39       97.78
         29 |         34        0.34       98.12
         30 |         29        0.29       98.41
         31 |         24        0.24       98.65
         32 |         18        0.18       98.83
         33 |         19        0.19       99.02
         34 |         11        0.11       99.13
         35 |         12        0.12       99.25
         36 |         13        0.13       99.38
         37 |         14        0.14       99.52
         38 |          8        0.08       99.60
         39 |          4        0.04       99.64
         40 |          9        0.09       99.73
         41 |          3        0.03       99.76
         42 |          2        0.02       99.78
         43 |          4        0.04       99.82
         44 |          2        0.02       99.84
         45 |          4        0.04       99.88
         46 |          1        0.01       99.89
         47 |          1        0.01       99.90
         48 |          1        0.01       99.91
         49 |          1        0.01       99.92
         51 |          1        0.01       99.93
         58 |          2        0.02       99.95
         59 |          1        0.01       99.96
         61 |          1        0.01       99.97
         65 |          1        0.01       99.98
         68 |          1        0.01       99.99
         69 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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