Frequencies for p7 variable in miper dataset :

         p7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        498       71.35       71.35
          1 |          5        0.72       72.06
          2 |          8        1.15       73.21
          3 |          4        0.57       73.78
          4 |          8        1.15       74.93
          5 |          9        1.29       76.22
          6 |          7        1.00       77.22
          7 |          5        0.72       77.94
          8 |          4        0.57       78.51
          9 |          7        1.00       79.51
         10 |          9        1.29       80.80
         11 |          8        1.15       81.95
         12 |          6        0.86       82.81
         13 |          8        1.15       83.95
         14 |          9        1.29       85.24
         15 |         10        1.43       86.68
         16 |          9        1.29       87.97
         17 |          7        1.00       88.97
         18 |          9        1.29       90.26
         19 |          8        1.15       91.40
         20 |         13        1.86       93.27
         21 |          7        1.00       94.27
         22 |          6        0.86       95.13
         23 |          5        0.72       95.85
         24 |          6        0.86       96.70
         25 |          3        0.43       97.13
         26 |          5        0.72       97.85
         27 |          4        0.57       98.42
         28 |          1        0.14       98.57
         29 |          2        0.29       98.85
         30 |          1        0.14       99.00
         32 |          2        0.29       99.28
         34 |          1        0.14       99.43
         36 |          2        0.29       99.71
         38 |          1        0.14       99.86
         40 |          1        0.14      100.00
------------+-----------------------------------
      Total |        698      100.00

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