Frequencies for p7 variable in miper dataset :

         p7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        580       70.22       70.22
          1 |          2        0.24       70.46
          2 |         10        1.21       71.67
          3 |          8        0.97       72.64
          4 |          7        0.85       73.49
          5 |         14        1.69       75.18
          6 |          8        0.97       76.15
          7 |          6        0.73       76.88
          8 |          7        0.85       77.72
          9 |         10        1.21       78.93
         10 |          7        0.85       79.78
         11 |         11        1.33       81.11
         12 |          9        1.09       82.20
         13 |          6        0.73       82.93
         14 |          9        1.09       84.02
         15 |         12        1.45       85.47
         16 |         12        1.45       86.92
         17 |          7        0.85       87.77
         18 |          8        0.97       88.74
         19 |         11        1.33       90.07
         20 |          5        0.61       90.68
         21 |          7        0.85       91.53
         22 |          4        0.48       92.01
         23 |         12        1.45       93.46
         24 |         12        1.45       94.92
         25 |          9        1.09       96.00
         26 |          4        0.48       96.49
         27 |          7        0.85       97.34
         28 |          4        0.48       97.82
         29 |          2        0.24       98.06
         30 |          2        0.24       98.31
         31 |          1        0.12       98.43
         32 |          6        0.73       99.15
         34 |          1        0.12       99.27
         35 |          3        0.36       99.64
         40 |          2        0.24       99.88
         41 |          1        0.12      100.00
------------+-----------------------------------
      Total |        826      100.00

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