Frequencies for first 10,000 rows of p4 variable in miper dataset :

         p4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,587       75.87       75.87
          1 |         41        0.41       76.28
          2 |         70        0.70       76.98
          3 |         59        0.59       77.57
          4 |         52        0.52       78.09
          5 |         47        0.47       78.56
          6 |         58        0.58       79.14
          7 |         63        0.63       79.77
          8 |         87        0.87       80.64
          9 |         91        0.91       81.55
         10 |         86        0.86       82.41
         11 |         96        0.96       83.37
         12 |        111        1.11       84.48
         13 |        107        1.07       85.55
         14 |         98        0.98       86.53
         15 |        105        1.05       87.58
         16 |        102        1.02       88.60
         17 |        102        1.02       89.62
         18 |         95        0.95       90.57
         19 |         83        0.83       91.40
         20 |         90        0.90       92.30
         21 |         98        0.98       93.28
         22 |         89        0.89       94.17
         23 |         74        0.74       94.91
         24 |         78        0.78       95.69
         25 |         64        0.64       96.33
         26 |         66        0.66       96.99
         27 |         48        0.48       97.47
         28 |         40        0.40       97.87
         29 |         37        0.37       98.24
         30 |         31        0.31       98.55
         31 |         25        0.25       98.80
         32 |         22        0.22       99.02
         33 |         11        0.11       99.13
         34 |         13        0.13       99.26
         35 |         14        0.14       99.40
         36 |         18        0.18       99.58
         37 |          9        0.09       99.67
         38 |          7        0.07       99.74
         39 |          7        0.07       99.81
         40 |          5        0.05       99.86
         41 |          3        0.03       99.89
         42 |          2        0.02       99.91
         43 |          2        0.02       99.93
         44 |          2        0.02       99.95
         46 |          1        0.01       99.96
         49 |          3        0.03       99.99
         51 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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