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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,784       67.84       67.84
          1 |         28        0.28       68.12
          2 |         65        0.65       68.77
          3 |         74        0.74       69.51
          4 |         54        0.54       70.05
          5 |         83        0.83       70.88
          6 |         76        0.76       71.64
          7 |         87        0.87       72.51
          8 |         82        0.82       73.33
          9 |        116        1.16       74.49
         10 |        140        1.40       75.89
         11 |        122        1.22       77.11
         12 |        119        1.19       78.30
         13 |        127        1.27       79.57
         14 |        140        1.40       80.97
         15 |        147        1.47       82.44
         16 |        177        1.77       84.21
         17 |        149        1.49       85.70
         18 |        166        1.66       87.36
         19 |        134        1.34       88.70
         20 |        150        1.50       90.20
         21 |        123        1.23       91.43
         22 |        105        1.05       92.48
         23 |         95        0.95       93.43
         24 |         95        0.95       94.38
         25 |         93        0.93       95.31
         26 |         80        0.80       96.11
         27 |         55        0.55       96.66
         28 |         61        0.61       97.27
         29 |         49        0.49       97.76
         30 |         38        0.38       98.14
         31 |         41        0.41       98.55
         32 |         21        0.21       98.76
         33 |         20        0.20       98.96
         34 |         19        0.19       99.15
         35 |          8        0.08       99.23
         36 |         16        0.16       99.39
         37 |         13        0.13       99.52
         38 |         10        0.10       99.62
         39 |          8        0.08       99.70
         40 |          4        0.04       99.74
         41 |          4        0.04       99.78
         42 |          1        0.01       99.79
         43 |          5        0.05       99.84
         44 |          1        0.01       99.85
         45 |          5        0.05       99.90
         46 |          3        0.03       99.93
         47 |          3        0.03       99.96
         48 |          1        0.01       99.97
         54 |          1        0.01       99.98
         56 |          1        0.01       99.99
         88 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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