tuna.def

sal1 apr1 apr2 apr3 disp dispad 

   Obs:   52 Weekly observations

   sal1		number of cans of brand #1 sold during week
   apr1		average price per can of brand #1 during week
   apr2		average price per can of brand #2 during week
   apr3		average price per can of brand #3 during week           
   disp		=1 if there is a store display for brand #1 during week, but no newspaper ad
   dispad	=1 if there is a store display for brand #1 during week AND a newspaper ad during week

Data source: Nielsen Marketing Research    



    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
        sal1 |        52    6718.712    6915.083       1762      32820
        apr1 |        52       .7825    .0980371        .61        .92
        apr2 |        52    .8059615    .1121494        .43        .93
        apr3 |        52    .7936538    .0800987        .59         .9
        disp |        52    .4423077     .501506          0          1
-------------+--------------------------------------------------------
      dispad |        52    .1730769    .3820047          0          1