Frequencies for first 10,000 rows of p9 variable in miper dataset :

         p9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,452       74.52       74.52
          1 |         38        0.38       74.90
          2 |         64        0.64       75.54
          3 |         64        0.64       76.18
          4 |         52        0.52       76.70
          5 |         64        0.64       77.34
          6 |         83        0.83       78.17
          7 |         86        0.86       79.03
          8 |         96        0.96       79.99
          9 |         89        0.89       80.88
         10 |         93        0.93       81.81
         11 |        102        1.02       82.83
         12 |         99        0.99       83.82
         13 |         96        0.96       84.78
         14 |        111        1.11       85.89
         15 |        105        1.05       86.94
         16 |        115        1.15       88.09
         17 |        112        1.12       89.21
         18 |        118        1.18       90.39
         19 |         96        0.96       91.35
         20 |         92        0.92       92.27
         21 |        106        1.06       93.33
         22 |         81        0.81       94.14
         23 |         77        0.77       94.91
         24 |         58        0.58       95.49
         25 |         86        0.86       96.35
         26 |         62        0.62       96.97
         27 |         51        0.51       97.48
         28 |         47        0.47       97.95
         29 |         37        0.37       98.32
         30 |         36        0.36       98.68
         31 |         20        0.20       98.88
         32 |         22        0.22       99.10
         33 |         10        0.10       99.20
         34 |          9        0.09       99.29
         35 |         19        0.19       99.48
         36 |          8        0.08       99.56
         37 |          6        0.06       99.62
         38 |          1        0.01       99.63
         39 |          8        0.08       99.71
         40 |          3        0.03       99.74
         41 |          4        0.04       99.78
         42 |          4        0.04       99.82
         43 |          4        0.04       99.86
         44 |          3        0.03       99.89
         45 |          1        0.01       99.90
         48 |          2        0.02       99.92
         49 |          1        0.01       99.93
         50 |          2        0.02       99.95
         52 |          1        0.01       99.96
         54 |          2        0.02       99.98
         60 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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