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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,588       65.88       65.88
          1 |         34        0.34       66.22
          2 |         68        0.68       66.90
          3 |         73        0.73       67.63
          4 |         67        0.67       68.30
          5 |         78        0.78       69.08
          6 |         79        0.79       69.87
          7 |        102        1.02       70.89
          8 |        105        1.05       71.94
          9 |        122        1.22       73.16
         10 |        133        1.33       74.49
         11 |        137        1.37       75.86
         12 |        135        1.35       77.21
         13 |        171        1.71       78.92
         14 |        161        1.61       80.53
         15 |        149        1.49       82.02
         16 |        169        1.69       83.71
         17 |        148        1.48       85.19
         18 |        153        1.53       86.72
         19 |        140        1.40       88.12
         20 |        156        1.56       89.68
         21 |        155        1.55       91.23
         22 |        119        1.19       92.42
         23 |        114        1.14       93.56
         24 |        101        1.01       94.57
         25 |         90        0.90       95.47
         26 |         71        0.71       96.18
         27 |         70        0.70       96.88
         28 |         62        0.62       97.50
         29 |         46        0.46       97.96
         30 |         30        0.30       98.26
         31 |         27        0.27       98.53
         32 |         28        0.28       98.81
         33 |         21        0.21       99.02
         34 |         18        0.18       99.20
         35 |         16        0.16       99.36
         36 |         14        0.14       99.50
         37 |          6        0.06       99.56
         38 |         15        0.15       99.71
         39 |          9        0.09       99.80
         40 |          3        0.03       99.83
         41 |          3        0.03       99.86
         42 |          4        0.04       99.90
         43 |          1        0.01       99.91
         44 |          1        0.01       99.92
         45 |          1        0.01       99.93
         47 |          1        0.01       99.94
         49 |          2        0.02       99.96
         54 |          1        0.01       99.97
         56 |          1        0.01       99.98
         59 |          1        0.01       99.99
         80 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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