Dataset: feltmarker.dat

Source: P.J. McClure and E.J. West (1969). "Sales Effects of a New 
Counter Display," Journal of Advertising Research, Vol.9, #1, pp. 29-34.

Description: Weekly sales of felt-tip markers in 4 drug and 
4 stationary stores pre- and during use of a Counter Display 
2 Experimental and 2 control stores per store type, 3 weeks pre- and during
experiment.

Variables/ Columns
Store Type    8    /* 1=Drug, 2=Stationary  */
Condition     16   /* 1=Experimental, 2=Control   */
Store Number  24
Period        32  /* 1=Pre-test, 2=Test Period  */
Week          40
Sales ($)     42-48