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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,378       73.78       73.78
          1 |         51        0.51       74.29
          2 |         56        0.56       74.85
          3 |         59        0.59       75.44
          4 |         71        0.71       76.15
          5 |         79        0.79       76.94
          6 |         74        0.74       77.68
          7 |         82        0.82       78.50
          8 |         77        0.77       79.27
          9 |         85        0.85       80.12
         10 |        105        1.05       81.17
         11 |        107        1.07       82.24
         12 |        113        1.13       83.37
         13 |        108        1.08       84.45
         14 |        101        1.01       85.46
         15 |        129        1.29       86.75
         16 |        125        1.25       88.00
         17 |         99        0.99       88.99
         18 |        105        1.05       90.04
         19 |        108        1.08       91.12
         20 |        103        1.03       92.15
         21 |        123        1.23       93.38
         22 |         99        0.99       94.37
         23 |         83        0.83       95.20
         24 |         64        0.64       95.84
         25 |         74        0.74       96.58
         26 |         59        0.59       97.17
         27 |         54        0.54       97.71
         28 |         34        0.34       98.05
         29 |         33        0.33       98.38
         30 |         25        0.25       98.63
         31 |         25        0.25       98.88
         32 |         17        0.17       99.05
         33 |         10        0.10       99.15
         34 |         17        0.17       99.32
         35 |         17        0.17       99.49
         36 |          9        0.09       99.58
         37 |          6        0.06       99.64
         38 |         12        0.12       99.76
         39 |          6        0.06       99.82
         40 |          1        0.01       99.83
         41 |          3        0.03       99.86
         42 |          2        0.02       99.88
         43 |          2        0.02       99.90
         45 |          2        0.02       99.92
         46 |          1        0.01       99.93
         47 |          1        0.01       99.94
         49 |          2        0.02       99.96
         52 |          1        0.01       99.97
         54 |          1        0.01       99.98
         57 |          1        0.01       99.99
         61 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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