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

       does |
  physician |
         do |
  telephone |
  consults? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,581       25.81       25.81
          1 |      5,891       58.91       84.72
          2 |      1,528       15.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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