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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,504       75.04       75.04
          1 |         40        0.40       75.44
          2 |         57        0.57       76.01
          3 |         60        0.60       76.61
          4 |         53        0.53       77.14
          5 |         52        0.52       77.66
          6 |         62        0.62       78.28
          7 |         66        0.66       78.94
          8 |         91        0.91       79.85
          9 |         96        0.96       80.81
         10 |         91        0.91       81.72
         11 |         96        0.96       82.68
         12 |        100        1.00       83.68
         13 |        100        1.00       84.68
         14 |        111        1.11       85.79
         15 |        126        1.26       87.05
         16 |        112        1.12       88.17
         17 |         90        0.90       89.07
         18 |        106        1.06       90.13
         19 |         99        0.99       91.12
         20 |        109        1.09       92.21
         21 |         76        0.76       92.97
         22 |         85        0.85       93.82
         23 |         98        0.98       94.80
         24 |         63        0.63       95.43
         25 |         63        0.63       96.06
         26 |         53        0.53       96.59
         27 |         61        0.61       97.20
         28 |         46        0.46       97.66
         29 |         28        0.28       97.94
         30 |         26        0.26       98.20
         31 |         25        0.25       98.45
         32 |         26        0.26       98.71
         33 |         20        0.20       98.91
         34 |         14        0.14       99.05
         35 |         23        0.23       99.28
         36 |         12        0.12       99.40
         37 |          4        0.04       99.44
         38 |          8        0.08       99.52
         39 |          9        0.09       99.61
         40 |         10        0.10       99.71
         41 |          7        0.07       99.78
         42 |          1        0.01       99.79
         43 |          4        0.04       99.83
         44 |          2        0.02       99.85
         45 |          4        0.04       99.89
         46 |          4        0.04       99.93
         47 |          2        0.02       99.95
         48 |          1        0.01       99.96
         49 |          2        0.02       99.98
         50 |          1        0.01       99.99
         56 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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