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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,301       73.01       73.01
          1 |         32        0.32       73.33
          2 |         77        0.77       74.10
          3 |         58        0.58       74.68
          4 |         58        0.58       75.26
          5 |         65        0.65       75.91
          6 |         75        0.75       76.66
          7 |         71        0.71       77.37
          8 |         89        0.89       78.26
          9 |         91        0.91       79.17
         10 |        105        1.05       80.22
         11 |        104        1.04       81.26
         12 |        120        1.20       82.46
         13 |        115        1.15       83.61
         14 |        116        1.16       84.77
         15 |        130        1.30       86.07
         16 |        125        1.25       87.32
         17 |        125        1.25       88.57
         18 |        133        1.33       89.90
         19 |        114        1.14       91.04
         20 |        103        1.03       92.07
         21 |        107        1.07       93.14
         22 |         86        0.86       94.00
         23 |         80        0.80       94.80
         24 |         63        0.63       95.43
         25 |         58        0.58       96.01
         26 |         56        0.56       96.57
         27 |         52        0.52       97.09
         28 |         39        0.39       97.48
         29 |         52        0.52       98.00
         30 |         40        0.40       98.40
         31 |         25        0.25       98.65
         32 |         23        0.23       98.88
         33 |         19        0.19       99.07
         34 |         22        0.22       99.29
         35 |         16        0.16       99.45
         36 |         16        0.16       99.61
         37 |          3        0.03       99.64
         38 |          6        0.06       99.70
         39 |          5        0.05       99.75
         40 |          5        0.05       99.80
         41 |          6        0.06       99.86
         42 |          2        0.02       99.88
         43 |          4        0.04       99.92
         45 |          4        0.04       99.96
         49 |          1        0.01       99.97
         50 |          1        0.01       99.98
         55 |          1        0.01       99.99
         93 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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