Frequencies for p7 variable in miper dataset :

         p7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        673       71.14       71.14
          1 |          1        0.11       71.25
          2 |         10        1.06       72.30
          3 |          8        0.85       73.15
          4 |         11        1.16       74.31
          5 |          8        0.85       75.16
          6 |          6        0.63       75.79
          7 |          7        0.74       76.53
          8 |         14        1.48       78.01
          9 |          5        0.53       78.54
         10 |         12        1.27       79.81
         11 |          9        0.95       80.76
         12 |         11        1.16       81.92
         13 |         11        1.16       83.09
         14 |         15        1.59       84.67
         15 |          9        0.95       85.62
         16 |         11        1.16       86.79
         17 |          8        0.85       87.63
         18 |         11        1.16       88.79
         19 |         14        1.48       90.27
         20 |         12        1.27       91.54
         21 |          8        0.85       92.39
         22 |          3        0.32       92.71
         23 |         10        1.06       93.76
         24 |          9        0.95       94.71
         25 |          5        0.53       95.24
         26 |          9        0.95       96.19
         27 |          2        0.21       96.41
         28 |          2        0.21       96.62
         29 |          7        0.74       97.36
         30 |          3        0.32       97.67
         31 |          1        0.11       97.78
         32 |          5        0.53       98.31
         33 |          3        0.32       98.63
         34 |          3        0.32       98.94
         35 |          2        0.21       99.15
         36 |          2        0.21       99.37
         37 |          1        0.11       99.47
         38 |          1        0.11       99.58
         39 |          1        0.11       99.68
         40 |          2        0.21       99.89
         42 |          1        0.11      100.00
------------+-----------------------------------
      Total |        946      100.00

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