Frequencies for econr variable in namcsphys2005_2010 dataset :

        did |
  physician |
   do email |
   consults |
during last |
normal week |
         of |
  practice? |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        368        4.94        4.94
          0 |      6,500       87.26       92.20
          1 |        581        7.80      100.00
------------+-----------------------------------
      Total |      7,449      100.00

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