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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,447       74.47       74.47
          1 |         35        0.35       74.82
          2 |         51        0.51       75.33
          3 |         61        0.61       75.94
          4 |         69        0.69       76.63
          5 |         59        0.59       77.22
          6 |         57        0.57       77.79
          7 |         59        0.59       78.38
          8 |         71        0.71       79.09
          9 |         80        0.80       79.89
         10 |         83        0.83       80.72
         11 |         81        0.81       81.53
         12 |        101        1.01       82.54
         13 |         95        0.95       83.49
         14 |        110        1.10       84.59
         15 |        125        1.25       85.84
         16 |        120        1.20       87.04
         17 |        109        1.09       88.13
         18 |        125        1.25       89.38
         19 |        100        1.00       90.38
         20 |         95        0.95       91.33
         21 |        102        1.02       92.35
         22 |         81        0.81       93.16
         23 |         93        0.93       94.09
         24 |         81        0.81       94.90
         25 |         66        0.66       95.56
         26 |         61        0.61       96.17
         27 |         77        0.77       96.94
         28 |         45        0.45       97.39
         29 |         27        0.27       97.66
         30 |         31        0.31       97.97
         31 |         25        0.25       98.22
         32 |         29        0.29       98.51
         33 |         23        0.23       98.74
         34 |         23        0.23       98.97
         35 |         20        0.20       99.17
         36 |         12        0.12       99.29
         37 |         18        0.18       99.47
         38 |          9        0.09       99.56
         39 |          6        0.06       99.62
         40 |          9        0.09       99.71
         41 |          5        0.05       99.76
         42 |          1        0.01       99.77
         43 |          5        0.05       99.82
         44 |          1        0.01       99.83
         45 |          3        0.03       99.86
         46 |          2        0.02       99.88
         48 |          1        0.01       99.89
         49 |          1        0.01       99.90
         50 |          2        0.02       99.92
         51 |          1        0.01       99.93
         52 |          1        0.01       99.94
         61 |          1        0.01       99.95
         63 |          1        0.01       99.96
         64 |          2        0.02       99.98
         73 |          1        0.01       99.99
         76 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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