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

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,022       60.22       60.22
          1 |         33        0.33       60.55
          2 |         72        0.72       61.27
          3 |         75        0.75       62.02
          4 |         82        0.82       62.84
          5 |         83        0.83       63.67
          6 |         93        0.93       64.60
          7 |        115        1.15       65.75
          8 |        137        1.37       67.12
          9 |        140        1.40       68.52
         10 |        163        1.63       70.15
         11 |        158        1.58       71.73
         12 |        171        1.71       73.44
         13 |        159        1.59       75.03
         14 |        185        1.85       76.88
         15 |        159        1.59       78.47
         16 |        216        2.16       80.63
         17 |        205        2.05       82.68
         18 |        187        1.87       84.55
         19 |        191        1.91       86.46
         20 |        175        1.75       88.21
         21 |        150        1.50       89.71
         22 |        153        1.53       91.24
         23 |        135        1.35       92.59
         24 |        118        1.18       93.77
         25 |        109        1.09       94.86
         26 |         85        0.85       95.71
         27 |         71        0.71       96.42
         28 |         66        0.66       97.08
         29 |         45        0.45       97.53
         30 |         44        0.44       97.97
         31 |         31        0.31       98.28
         32 |         35        0.35       98.63
         33 |         35        0.35       98.98
         34 |         19        0.19       99.17
         35 |         15        0.15       99.32
         36 |         12        0.12       99.44
         37 |         15        0.15       99.59
         38 |         11        0.11       99.70
         39 |          8        0.08       99.78
         40 |          2        0.02       99.80
         41 |          4        0.04       99.84
         42 |          6        0.06       99.90
         43 |          3        0.03       99.93
         44 |          2        0.02       99.95
         45 |          1        0.01       99.96
         46 |          2        0.02       99.98
         48 |          1        0.01       99.99
         50 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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