Frequencies for first 10,000 rows of econr variable in namcs2001 dataset :

       does |
  physician |
   do email |
  consults? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,037       80.37       80.37
          1 |        660        6.60       86.97
          2 |      1,303       13.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016