Frequencies for first 10,000 rows of tau variable in nsrd dataset :

    Average |
  Broadband |
    Aerosol |
    Optical |
      Depth |
 (unitless) |      Freq.     Percent        Cum.
------------+-----------------------------------
        .02 |        132        1.32        1.32
        .03 |      1,150       11.50       12.82
        .04 |        974        9.74       22.56
        .05 |        775        7.75       30.31
        .06 |        822        8.22       38.53
        .07 |        794        7.94       46.47
        .08 |      1,040       10.40       56.87
        .09 |        760        7.60       64.47
         .1 |        859        8.59       73.06
        .11 |        855        8.55       81.61
        .12 |        507        5.07       86.68
        .13 |        555        5.55       92.23
        .14 |        220        2.20       94.43
        .15 |         83        0.83       95.26
        .16 |         55        0.55       95.81
        .17 |         44        0.44       96.25
        .18 |         34        0.34       96.59
        .19 |         19        0.19       96.78
         .2 |         39        0.39       97.17
        .21 |         25        0.25       97.42
        .22 |         42        0.42       97.84
        .23 |         11        0.11       97.95
        .24 |         31        0.31       98.26
        .25 |         17        0.17       98.43
        .26 |         25        0.25       98.68
        .27 |         22        0.22       98.90
        .28 |         32        0.32       99.22
        .29 |         25        0.25       99.47
         .3 |         25        0.25       99.72
        .31 |         15        0.15       99.87
        .32 |         11        0.11       99.98
        .33 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016