Frequencies for p1 variable in miper dataset :

         p1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        672       71.04       71.04
          1 |          1        0.11       71.14
          2 |         12        1.27       72.41
          3 |          7        0.74       73.15
          4 |         10        1.06       74.21
          5 |          7        0.74       74.95
          6 |          6        0.63       75.58
          7 |          7        0.74       76.32
          8 |          7        0.74       77.06
          9 |          7        0.74       77.80
         10 |         11        1.16       78.96
         11 |         11        1.16       80.13
         12 |         10        1.06       81.18
         13 |         14        1.48       82.66
         14 |         14        1.48       84.14
         15 |         14        1.48       85.62
         16 |          8        0.85       86.47
         17 |         10        1.06       87.53
         18 |         12        1.27       88.79
         19 |         12        1.27       90.06
         20 |         13        1.37       91.44
         21 |         10        1.06       92.49
         22 |          5        0.53       93.02
         23 |         11        1.16       94.19
         24 |         10        1.06       95.24
         25 |          4        0.42       95.67
         26 |          7        0.74       96.41
         27 |          3        0.32       96.72
         28 |          4        0.42       97.15
         29 |          5        0.53       97.67
         30 |          3        0.32       97.99
         31 |          3        0.32       98.31
         32 |          3        0.32       98.63
         33 |          3        0.32       98.94
         34 |          2        0.21       99.15
         35 |          2        0.21       99.37
         36 |          2        0.21       99.58
         39 |          1        0.11       99.68
         40 |          2        0.21       99.89
         45 |          1        0.11      100.00
------------+-----------------------------------
      Total |        946      100.00

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