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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,665       66.65       66.65
          1 |         43        0.43       67.08
          2 |         79        0.79       67.87
          3 |         84        0.84       68.71
          4 |         65        0.65       69.36
          5 |         72        0.72       70.08
          6 |         94        0.94       71.02
          7 |         93        0.93       71.95
          8 |         96        0.96       72.91
          9 |        125        1.25       74.16
         10 |        112        1.12       75.28
         11 |        140        1.40       76.68
         12 |        135        1.35       78.03
         13 |        119        1.19       79.22
         14 |        130        1.30       80.52
         15 |        175        1.75       82.27
         16 |        177        1.77       84.04
         17 |        177        1.77       85.81
         18 |        150        1.50       87.31
         19 |        148        1.48       88.79
         20 |        153        1.53       90.32
         21 |        147        1.47       91.79
         22 |        119        1.19       92.98
         23 |        107        1.07       94.05
         24 |         99        0.99       95.04
         25 |         77        0.77       95.81
         26 |         69        0.69       96.50
         27 |         67        0.67       97.17
         28 |         55        0.55       97.72
         29 |         39        0.39       98.11
         30 |         41        0.41       98.52
         31 |         31        0.31       98.83
         32 |         16        0.16       98.99
         33 |         23        0.23       99.22
         34 |         13        0.13       99.35
         35 |         11        0.11       99.46
         36 |          6        0.06       99.52
         37 |         10        0.10       99.62
         38 |          5        0.05       99.67
         39 |          5        0.05       99.72
         40 |          7        0.07       99.79
         41 |          2        0.02       99.81
         42 |          2        0.02       99.83
         43 |          3        0.03       99.86
         44 |          4        0.04       99.90
         46 |          2        0.02       99.92
         47 |          1        0.01       99.93
         48 |          2        0.02       99.95
         49 |          1        0.01       99.96
         52 |          1        0.01       99.97
         54 |          1        0.01       99.98
         56 |          1        0.01       99.99
         66 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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