Frequencies for first 10,000 rows of econr variable in namcs2003 dataset :

did phys do |
      email |
   consults |
  last full |
   wk prac? |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,365       83.65       83.65
        Yes |        365        3.65       87.30
      Blank |      1,270       12.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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