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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,449       74.49       74.49
          1 |         37        0.37       74.86
          2 |         66        0.66       75.52
          3 |         63        0.63       76.15
          4 |         76        0.76       76.91
          5 |         70        0.70       77.61
          6 |         79        0.79       78.40
          7 |         70        0.70       79.10
          8 |         78        0.78       79.88
          9 |         89        0.89       80.77
         10 |        100        1.00       81.77
         11 |         97        0.97       82.74
         12 |         94        0.94       83.68
         13 |        100        1.00       84.68
         14 |        105        1.05       85.73
         15 |        110        1.10       86.83
         16 |        106        1.06       87.89
         17 |        117        1.17       89.06
         18 |        111        1.11       90.17
         19 |         95        0.95       91.12
         20 |        106        1.06       92.18
         21 |        102        1.02       93.20
         22 |         83        0.83       94.03
         23 |         81        0.81       94.84
         24 |         74        0.74       95.58
         25 |         73        0.73       96.31
         26 |         67        0.67       96.98
         27 |         53        0.53       97.51
         28 |         48        0.48       97.99
         29 |         33        0.33       98.32
         30 |         39        0.39       98.71
         31 |         19        0.19       98.90
         32 |         22        0.22       99.12
         33 |         11        0.11       99.23
         34 |         11        0.11       99.34
         35 |         15        0.15       99.49
         36 |         11        0.11       99.60
         37 |          4        0.04       99.64
         38 |          2        0.02       99.66
         39 |          7        0.07       99.73
         40 |          5        0.05       99.78
         41 |          2        0.02       99.80
         42 |          3        0.03       99.83
         43 |          4        0.04       99.87
         44 |          2        0.02       99.89
         47 |          1        0.01       99.90
         48 |          3        0.03       99.93
         49 |          1        0.01       99.94
         50 |          2        0.02       99.96
         51 |          1        0.01       99.97
         54 |          1        0.01       99.98
         60 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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