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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,475       74.75       74.75
          1 |         36        0.36       75.11
          2 |         73        0.73       75.84
          3 |         65        0.65       76.49
          4 |         64        0.64       77.13
          5 |         54        0.54       77.67
          6 |         69        0.69       78.36
          7 |         87        0.87       79.23
          8 |         80        0.80       80.03
          9 |         88        0.88       80.91
         10 |         84        0.84       81.75
         11 |         95        0.95       82.70
         12 |        108        1.08       83.78
         13 |        113        1.13       84.91
         14 |        114        1.14       86.05
         15 |         95        0.95       87.00
         16 |        115        1.15       88.15
         17 |        119        1.19       89.34
         18 |        110        1.10       90.44
         19 |        102        1.02       91.46
         20 |         94        0.94       92.40
         21 |        100        1.00       93.40
         22 |         78        0.78       94.18
         23 |         82        0.82       95.00
         24 |         70        0.70       95.70
         25 |         73        0.73       96.43
         26 |         63        0.63       97.06
         27 |         52        0.52       97.58
         28 |         41        0.41       97.99
         29 |         26        0.26       98.25
         30 |         36        0.36       98.61
         31 |         21        0.21       98.82
         32 |         26        0.26       99.08
         33 |         20        0.20       99.28
         34 |         10        0.10       99.38
         35 |         11        0.11       99.49
         36 |          7        0.07       99.56
         37 |          6        0.06       99.62
         38 |          6        0.06       99.68
         39 |          7        0.07       99.75
         40 |          3        0.03       99.78
         41 |          2        0.02       99.80
         42 |          5        0.05       99.85
         43 |          2        0.02       99.87
         44 |          3        0.03       99.90
         45 |          6        0.06       99.96
         46 |          2        0.02       99.98
         51 |          1        0.01       99.99
         53 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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