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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,420       74.20       74.20
          1 |         32        0.32       74.52
          2 |         56        0.56       75.08
          3 |         53        0.53       75.61
          4 |         48        0.48       76.09
          5 |         47        0.47       76.56
          6 |         73        0.73       77.29
          7 |         79        0.79       78.08
          8 |         93        0.93       79.01
          9 |         83        0.83       79.84
         10 |         69        0.69       80.53
         11 |         98        0.98       81.51
         12 |        100        1.00       82.51
         13 |        114        1.14       83.65
         14 |        124        1.24       84.89
         15 |        106        1.06       85.95
         16 |        111        1.11       87.06
         17 |        106        1.06       88.12
         18 |        107        1.07       89.19
         19 |        116        1.16       90.35
         20 |         93        0.93       91.28
         21 |        114        1.14       92.42
         22 |         86        0.86       93.28
         23 |         82        0.82       94.10
         24 |         85        0.85       94.95
         25 |         62        0.62       95.57
         26 |         69        0.69       96.26
         27 |         57        0.57       96.83
         28 |         52        0.52       97.35
         29 |         42        0.42       97.77
         30 |         32        0.32       98.09
         31 |         36        0.36       98.45
         32 |         20        0.20       98.65
         33 |         20        0.20       98.85
         34 |         20        0.20       99.05
         35 |         17        0.17       99.22
         36 |          8        0.08       99.30
         37 |         16        0.16       99.46
         38 |         14        0.14       99.60
         39 |          9        0.09       99.69
         40 |          9        0.09       99.78
         41 |          6        0.06       99.84
         42 |          2        0.02       99.86
         43 |          3        0.03       99.89
         44 |          2        0.02       99.91
         45 |          4        0.04       99.95
         46 |          3        0.03       99.98
         53 |          1        0.01       99.99
         56 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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