Frequencies for p2 variable in miper dataset :

         p2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        575       69.61       69.61
          1 |          3        0.36       69.98
          2 |         10        1.21       71.19
          3 |          8        0.97       72.15
          4 |          8        0.97       73.12
          5 |         12        1.45       74.58
          6 |          9        1.09       75.67
          7 |          5        0.61       76.27
          8 |          8        0.97       77.24
          9 |         11        1.33       78.57
         10 |         13        1.57       80.15
         11 |          8        0.97       81.11
         12 |          9        1.09       82.20
         13 |          6        0.73       82.93
         14 |          7        0.85       83.78
         15 |         12        1.45       85.23
         16 |         15        1.82       87.05
         17 |          8        0.97       88.01
         18 |         10        1.21       89.23
         19 |         10        1.21       90.44
         20 |          5        0.61       91.04
         21 |          7        0.85       91.89
         22 |          4        0.48       92.37
         23 |         10        1.21       93.58
         24 |         11        1.33       94.92
         25 |          9        1.09       96.00
         26 |          3        0.36       96.37
         27 |          6        0.73       97.09
         28 |          4        0.48       97.58
         29 |          3        0.36       97.94
         30 |          2        0.24       98.18
         31 |          1        0.12       98.31
         32 |          5        0.61       98.91
         34 |          1        0.12       99.03
         35 |          4        0.48       99.52
         40 |          2        0.24       99.76
         41 |          2        0.24      100.00
------------+-----------------------------------
      Total |        826      100.00

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