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

         p9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,456       74.56       74.56
          1 |         39        0.39       74.95
          2 |         53        0.53       75.48
          3 |         60        0.60       76.08
          4 |         56        0.56       76.64
          5 |         62        0.62       77.26
          6 |         61        0.61       77.87
          7 |         72        0.72       78.59
          8 |         91        0.91       79.50
          9 |         96        0.96       80.46
         10 |         94        0.94       81.40
         11 |        106        1.06       82.46
         12 |         99        0.99       83.45
         13 |        101        1.01       84.46
         14 |        112        1.12       85.58
         15 |        124        1.24       86.82
         16 |        119        1.19       88.01
         17 |        100        1.00       89.01
         18 |        115        1.15       90.16
         19 |        104        1.04       91.20
         20 |        110        1.10       92.30
         21 |         90        0.90       93.20
         22 |         86        0.86       94.06
         23 |         84        0.84       94.90
         24 |         61        0.61       95.51
         25 |         59        0.59       96.10
         26 |         59        0.59       96.69
         27 |         55        0.55       97.24
         28 |         44        0.44       97.68
         29 |         31        0.31       97.99
         30 |         29        0.29       98.28
         31 |         29        0.29       98.57
         32 |         21        0.21       98.78
         33 |         18        0.18       98.96
         34 |         11        0.11       99.07
         35 |         12        0.12       99.19
         36 |         17        0.17       99.36
         37 |          7        0.07       99.43
         38 |          8        0.08       99.51
         39 |         11        0.11       99.62
         40 |         10        0.10       99.72
         41 |         12        0.12       99.84
         43 |          3        0.03       99.87
         44 |          2        0.02       99.89
         45 |          2        0.02       99.91
         46 |          2        0.02       99.93
         47 |          2        0.02       99.95
         48 |          1        0.01       99.96
         49 |          2        0.02       99.98
         50 |          1        0.01       99.99
         57 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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