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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,341       73.41       73.41
          1 |         42        0.42       73.83
          2 |         65        0.65       74.48
          3 |         64        0.64       75.12
          4 |         63        0.63       75.75
          5 |         59        0.59       76.34
          6 |         69        0.69       77.03
          7 |         99        0.99       78.02
          8 |         88        0.88       78.90
          9 |         87        0.87       79.77
         10 |        105        1.05       80.82
         11 |         89        0.89       81.71
         12 |        127        1.27       82.98
         13 |        129        1.29       84.27
         14 |        105        1.05       85.32
         15 |        119        1.19       86.51
         16 |        108        1.08       87.59
         17 |        121        1.21       88.80
         18 |        118        1.18       89.98
         19 |        117        1.17       91.15
         20 |        115        1.15       92.30
         21 |        103        1.03       93.33
         22 |         97        0.97       94.30
         23 |         74        0.74       95.04
         24 |         69        0.69       95.73
         25 |         54        0.54       96.27
         26 |         55        0.55       96.82
         27 |         65        0.65       97.47
         28 |         40        0.40       97.87
         29 |         33        0.33       98.20
         30 |         34        0.34       98.54
         31 |         23        0.23       98.77
         32 |         21        0.21       98.98
         33 |         19        0.19       99.17
         34 |         13        0.13       99.30
         35 |         20        0.20       99.50
         36 |         10        0.10       99.60
         37 |          5        0.05       99.65
         38 |          3        0.03       99.68
         39 |          4        0.04       99.72
         40 |          6        0.06       99.78
         41 |          4        0.04       99.82
         42 |          2        0.02       99.84
         43 |          4        0.04       99.88
         44 |          2        0.02       99.90
         45 |          4        0.04       99.94
         46 |          1        0.01       99.95
         47 |          1        0.01       99.96
         48 |          2        0.02       99.98
         51 |          1        0.01       99.99
         52 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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