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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,145       71.45       71.45
          1 |         32        0.32       71.77
          2 |         79        0.79       72.56
          3 |         60        0.60       73.16
          4 |         69        0.69       73.85
          5 |         64        0.64       74.49
          6 |         74        0.74       75.23
          7 |         61        0.61       75.84
          8 |        101        1.01       76.85
          9 |         88        0.88       77.73
         10 |        109        1.09       78.82
         11 |        120        1.20       80.02
         12 |        123        1.23       81.25
         13 |        140        1.40       82.65
         14 |        112        1.12       83.77
         15 |        130        1.30       85.07
         16 |        145        1.45       86.52
         17 |        116        1.16       87.68
         18 |        121        1.21       88.89
         19 |        110        1.10       89.99
         20 |        122        1.22       91.21
         21 |         86        0.86       92.07
         22 |        111        1.11       93.18
         23 |         90        0.90       94.08
         24 |        102        1.02       95.10
         25 |         61        0.61       95.71
         26 |         55        0.55       96.26
         27 |         50        0.50       96.76
         28 |         49        0.49       97.25
         29 |         52        0.52       97.77
         30 |         39        0.39       98.16
         31 |         28        0.28       98.44
         32 |         30        0.30       98.74
         33 |         31        0.31       99.05
         34 |         17        0.17       99.22
         35 |         12        0.12       99.34
         36 |         14        0.14       99.48
         37 |         10        0.10       99.58
         38 |          8        0.08       99.66
         39 |          6        0.06       99.72
         40 |          9        0.09       99.81
         41 |          4        0.04       99.85
         42 |          3        0.03       99.88
         43 |          1        0.01       99.89
         44 |          1        0.01       99.90
         45 |          6        0.06       99.96
         46 |          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