Dataset: egyptcttn.csv

Source: Hamza, A.A. and Z.N. Sokkar (1981). "Brightness of Egyptian Cotton
Fibers," Textile Research Journal, Vol. 51, pp. 587-590.

Description: Luminance scores and quality grades for 5 varieties of
Egyptian cotton. Model fit for each variety:   
Lum=a+b*ln(Grade)

Variables Names
variety 
luminance   
lnGrade  
grade     
giza69    (Dummy)
giza67    (Dummy)
giza70    (Dummy)
giza68    (Dummy)
lnGrG69   (Crossproduct)
lnGrG67   (Crossproduct)
lnGrG70   (Crossproduct)
lnGrG68   (Crossproduct)