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

       Average |
       Diffuse |
    Horizontal |
   Uncertainty |
          Flag |      Freq.     Percent        Cum.
---------------+-----------------------------------
Not Applicable |         40        0.40        0.40
         9-13% |      1,903       19.03       19.43
        13-18% |        386        3.86       23.29
        18-25% |        102        1.02       24.31
        25-35% |      7,527       75.27       99.58
        35-50% |         42        0.42      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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