Frequencies for first 10,000 rows of econr variable in namcs2004 dataset :

did phys do |
      email |
   consults |
  last full |
   wk prac? |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,409       84.09       84.09
        Yes |        367        3.67       87.76
      Blank |      1,224       12.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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