Dataset:  color_change.dat

Source: E. Ilec, B. Simoncic, A. Hladnik (2009). "Evaluation of Surfactant 
  Detergency using Statistical Analysis, Texile Research Journal,
  Vol. 79, #4, pp. 318-325.

Description: Color Change results of fabric of 3 varieties (cotton, silk, 
and wool) exposed to 4 soils (tea, coffee, wine, and charcoal),
washed at 2 temperatures (40C and 60C) 2 surfactants (anionic and
non-ionic) in a 4-Way ANOVA.

Variables/Columns
Soil Type   8  /* 1=tea, 2=coffee, 3=wine, 4=charcoal  */
Fabric type  16  /* 1=Cotton, 2=Silk, 3=Wool  */
Temperature  24  /* 1=40C, 2=60C  */
Surfactant   32  /* 1=anionic, 2=non-ionic  */