Frequencies for p9 variable in miper dataset :

         p9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        575       69.61       69.61
          1 |          2        0.24       69.85
          2 |         11        1.33       71.19
          3 |          7        0.85       72.03
          4 |          9        1.09       73.12
          5 |         12        1.45       74.58
          6 |         11        1.33       75.91
          7 |          6        0.73       76.63
          8 |          7        0.85       77.48
          9 |          9        1.09       78.57
         10 |          9        1.09       79.66
         11 |          9        1.09       80.75
         12 |          8        0.97       81.72
         13 |          6        0.73       82.45
         14 |          9        1.09       83.54
         15 |         10        1.21       84.75
         16 |         12        1.45       86.20
         17 |         11        1.33       87.53
         18 |          9        1.09       88.62
         19 |          9        1.09       89.71
         20 |          8        0.97       90.68
         21 |          7        0.85       91.53
         22 |          4        0.48       92.01
         23 |         11        1.33       93.34
         24 |         11        1.33       94.67
         25 |         11        1.33       96.00
         26 |          3        0.36       96.37
         27 |          5        0.61       96.97
         28 |          4        0.48       97.46
         29 |          2        0.24       97.70
         30 |          3        0.36       98.06
         31 |          1        0.12       98.18
         32 |          6        0.73       98.91
         34 |          1        0.12       99.03
         35 |          4        0.48       99.52
         37 |          1        0.12       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