Frequencies for p3 variable in miper dataset :

         p3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        676       71.46       71.46
          1 |          1        0.11       71.56
          2 |         11        1.16       72.73
          3 |          9        0.95       73.68
          4 |          8        0.85       74.52
          5 |          7        0.74       75.26
          6 |          7        0.74       76.00
          7 |          5        0.53       76.53
          8 |          9        0.95       77.48
          9 |          8        0.85       78.33
         10 |         13        1.37       79.70
         11 |         13        1.37       81.08
         12 |         11        1.16       82.24
         13 |         11        1.16       83.40
         14 |         14        1.48       84.88
         15 |         15        1.59       86.47
         16 |         10        1.06       87.53
         17 |          8        0.85       88.37
         18 |         11        1.16       89.53
         19 |         11        1.16       90.70
         20 |         15        1.59       92.28
         21 |          6        0.63       92.92
         22 |          3        0.32       93.23
         23 |          9        0.95       94.19
         24 |         10        1.06       95.24
         25 |          6        0.63       95.88
         26 |          7        0.74       96.62
         27 |          3        0.32       96.93
         28 |          4        0.42       97.36
         29 |          6        0.63       97.99
         30 |          3        0.32       98.31
         31 |          1        0.11       98.41
         32 |          3        0.32       98.73
         33 |          3        0.32       99.05
         34 |          3        0.32       99.37
         35 |          2        0.21       99.58
         36 |          1        0.11       99.68
         39 |          1        0.11       99.79
         40 |          2        0.21      100.00
------------+-----------------------------------
      Total |        946      100.00

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