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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,145       61.45       61.45
          1 |         38        0.38       61.83
          2 |         79        0.79       62.62
          3 |         71        0.71       63.33
          4 |         73        0.73       64.06
          5 |        105        1.05       65.11
          6 |         92        0.92       66.03
          7 |        134        1.34       67.37
          8 |        126        1.26       68.63
          9 |        121        1.21       69.84
         10 |        137        1.37       71.21
         11 |        177        1.77       72.98
         12 |        187        1.87       74.85
         13 |        185        1.85       76.70
         14 |        177        1.77       78.47
         15 |        180        1.80       80.27
         16 |        179        1.79       82.06
         17 |        199        1.99       84.05
         18 |        183        1.83       85.88
         19 |        182        1.82       87.70
         20 |        166        1.66       89.36
         21 |        147        1.47       90.83
         22 |        133        1.33       92.16
         23 |        121        1.21       93.37
         24 |         94        0.94       94.31
         25 |         85        0.85       95.16
         26 |         86        0.86       96.02
         27 |         72        0.72       96.74
         28 |         66        0.66       97.40
         29 |         41        0.41       97.81
         30 |         39        0.39       98.20
         31 |         39        0.39       98.59
         32 |         22        0.22       98.81
         33 |         22        0.22       99.03
         34 |         15        0.15       99.18
         35 |         20        0.20       99.38
         36 |          8        0.08       99.46
         37 |          4        0.04       99.50
         38 |         12        0.12       99.62
         39 |          5        0.05       99.67
         40 |          5        0.05       99.72
         41 |          7        0.07       99.79
         42 |          7        0.07       99.86
         44 |          2        0.02       99.88
         45 |          3        0.03       99.91
         47 |          2        0.02       99.93
         48 |          3        0.03       99.96
         50 |          1        0.01       99.97
         52 |          1        0.01       99.98
         56 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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