Frequencies for p2 variable in miper dataset :

         p2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        680       71.88       71.88
          1 |          1        0.11       71.99
          2 |         10        1.06       73.04
          3 |          9        0.95       74.00
          4 |         11        1.16       75.16
          5 |         11        1.16       76.32
          6 |          5        0.53       76.85
          7 |          6        0.63       77.48
          8 |          7        0.74       78.22
          9 |          6        0.63       78.86
         10 |         13        1.37       80.23
         11 |         13        1.37       81.61
         12 |         11        1.16       82.77
         13 |         11        1.16       83.93
         14 |         12        1.27       85.20
         15 |         13        1.37       86.58
         16 |         12        1.27       87.84
         17 |          9        0.95       88.79
         18 |         13        1.37       90.17
         19 |          9        0.95       91.12
         20 |         11        1.16       92.28
         21 |          4        0.42       92.71
         22 |          3        0.32       93.02
         23 |          9        0.95       93.97
         24 |          8        0.85       94.82
         25 |          6        0.63       95.45
         26 |          8        0.85       96.30
         27 |          4        0.42       96.72
         28 |          3        0.32       97.04
         29 |          8        0.85       97.89
         30 |          3        0.32       98.20
         31 |          1        0.11       98.31
         32 |          4        0.42       98.73
         33 |          3        0.32       99.05
         34 |          2        0.21       99.26
         35 |          2        0.21       99.47
         36 |          1        0.11       99.58
         39 |          1        0.11       99.68
         40 |          2        0.21       99.89
         44 |          1        0.11      100.00
------------+-----------------------------------
      Total |        946      100.00

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