Frequencies for p3 variable in miper dataset :

         p3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        575       69.61       69.61
          1 |          2        0.24       69.85
          2 |         12        1.45       71.31
          3 |          6        0.73       72.03
          4 |          7        0.85       72.88
          5 |         13        1.57       74.46
          6 |          8        0.97       75.42
          7 |          6        0.73       76.15
          8 |          8        0.97       77.12
          9 |         12        1.45       78.57
         10 |         10        1.21       79.78
         11 |         12        1.45       81.23
         12 |         11        1.33       82.57
         13 |          5        0.61       83.17
         14 |          9        1.09       84.26
         15 |         12        1.45       85.71
         16 |         12        1.45       87.17
         17 |          9        1.09       88.26
         18 |          8        0.97       89.23
         19 |         11        1.33       90.56
         20 |          6        0.73       91.28
         21 |          7        0.85       92.13
         22 |          7        0.85       92.98
         23 |          9        1.09       94.07
         24 |         11        1.33       95.40
         25 |          8        0.97       96.37
         26 |          3        0.36       96.73
         27 |          5        0.61       97.34
         28 |          4        0.48       97.82
         29 |          1        0.12       97.94
         30 |          2        0.24       98.18
         31 |          1        0.12       98.31
         32 |          6        0.73       99.03
         34 |          1        0.12       99.15
         35 |          3        0.36       99.52
         40 |          2        0.24       99.76
         41 |          1        0.12       99.88
         48 |          1        0.12      100.00
------------+-----------------------------------
      Total |        826      100.00

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