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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,315       73.15       73.15
          1 |         45        0.45       73.60
          2 |         57        0.57       74.17
          3 |         67        0.67       74.84
          4 |         59        0.59       75.43
          5 |         64        0.64       76.07
          6 |         79        0.79       76.86
          7 |         80        0.80       77.66
          8 |         77        0.77       78.43
          9 |         75        0.75       79.18
         10 |         90        0.90       80.08
         11 |        124        1.24       81.32
         12 |         93        0.93       82.25
         13 |        117        1.17       83.42
         14 |         99        0.99       84.41
         15 |        127        1.27       85.68
         16 |        125        1.25       86.93
         17 |        112        1.12       88.05
         18 |        116        1.16       89.21
         19 |        125        1.25       90.46
         20 |        100        1.00       91.46
         21 |         97        0.97       92.43
         22 |        123        1.23       93.66
         23 |         95        0.95       94.61
         24 |         83        0.83       95.44
         25 |         68        0.68       96.12
         26 |         58        0.58       96.70
         27 |         52        0.52       97.22
         28 |         63        0.63       97.85
         29 |         32        0.32       98.17
         30 |         28        0.28       98.45
         31 |         30        0.30       98.75
         32 |         21        0.21       98.96
         33 |         14        0.14       99.10
         34 |         14        0.14       99.24
         35 |          9        0.09       99.33
         36 |         15        0.15       99.48
         37 |         10        0.10       99.58
         38 |         10        0.10       99.68
         39 |          4        0.04       99.72
         40 |          4        0.04       99.76
         41 |          3        0.03       99.79
         42 |          4        0.04       99.83
         43 |          2        0.02       99.85
         44 |          4        0.04       99.89
         45 |          3        0.03       99.92
         46 |          1        0.01       99.93
         47 |          1        0.01       99.94
         48 |          1        0.01       99.95
         50 |          1        0.01       99.96
         51 |          1        0.01       99.97
         52 |          1        0.01       99.98
         55 |          1        0.01       99.99
         78 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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