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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,332       73.32       73.32
          1 |         45        0.45       73.77
          2 |         70        0.70       74.47
          3 |         53        0.53       75.00
          4 |         70        0.70       75.70
          5 |         64        0.64       76.34
          6 |         77        0.77       77.11
          7 |         87        0.87       77.98
          8 |         88        0.88       78.86
          9 |         86        0.86       79.72
         10 |         97        0.97       80.69
         11 |         96        0.96       81.65
         12 |        121        1.21       82.86
         13 |        141        1.41       84.27
         14 |        105        1.05       85.32
         15 |        101        1.01       86.33
         16 |        107        1.07       87.40
         17 |        118        1.18       88.58
         18 |        108        1.08       89.66
         19 |        114        1.14       90.80
         20 |        112        1.12       91.92
         21 |        100        1.00       92.92
         22 |         98        0.98       93.90
         23 |         88        0.88       94.78
         24 |         78        0.78       95.56
         25 |         51        0.51       96.07
         26 |         59        0.59       96.66
         27 |         65        0.65       97.31
         28 |         51        0.51       97.82
         29 |         41        0.41       98.23
         30 |         33        0.33       98.56
         31 |         28        0.28       98.84
         32 |         16        0.16       99.00
         33 |         17        0.17       99.17
         34 |          8        0.08       99.25
         35 |         13        0.13       99.38
         36 |         14        0.14       99.52
         37 |         11        0.11       99.63
         38 |          9        0.09       99.72
         39 |          5        0.05       99.77
         40 |          5        0.05       99.82
         41 |          3        0.03       99.85
         42 |          2        0.02       99.87
         43 |          2        0.02       99.89
         44 |          1        0.01       99.90
         45 |          2        0.02       99.92
         46 |          3        0.03       99.95
         50 |          1        0.01       99.96
         51 |          2        0.02       99.98
         75 |          1        0.01       99.99
         81 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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