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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,328       63.28       63.28
          1 |         41        0.41       63.69
          2 |         71        0.71       64.40
          3 |         90        0.90       65.30
          4 |         96        0.96       66.26
          5 |         95        0.95       67.21
          6 |        106        1.06       68.27
          7 |        114        1.14       69.41
          8 |        120        1.20       70.61
          9 |        151        1.51       72.12
         10 |        159        1.59       73.71
         11 |        158        1.58       75.29
         12 |        164        1.64       76.93
         13 |        178        1.78       78.71
         14 |        156        1.56       80.27
         15 |        172        1.72       81.99
         16 |        175        1.75       83.74
         17 |        170        1.70       85.44
         18 |        180        1.80       87.24
         19 |        158        1.58       88.82
         20 |        140        1.40       90.22
         21 |        127        1.27       91.49
         22 |        129        1.29       92.78
         23 |        118        1.18       93.96
         24 |         86        0.86       94.82
         25 |         85        0.85       95.67
         26 |         74        0.74       96.41
         27 |         62        0.62       97.03
         28 |         55        0.55       97.58
         29 |         47        0.47       98.05
         30 |         50        0.50       98.55
         31 |         25        0.25       98.80
         32 |         23        0.23       99.03
         33 |         21        0.21       99.24
         34 |         14        0.14       99.38
         35 |          8        0.08       99.46
         36 |          7        0.07       99.53
         37 |          6        0.06       99.59
         38 |          8        0.08       99.67
         39 |          6        0.06       99.73
         40 |          5        0.05       99.78
         41 |          3        0.03       99.81
         42 |          4        0.04       99.85
         43 |          3        0.03       99.88
         44 |          4        0.04       99.92
         45 |          3        0.03       99.95
         49 |          1        0.01       99.96
         57 |          1        0.01       99.97
         62 |          1        0.01       99.98
         66 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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