Dataset: egyptcttn.dat

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/Columns
Variety    1-7
Luminance    12-16
ln(grade)   18-24
Grade      30-32
Giza69 Dummy   40
Giza67 Dummy    48
Giza70 Dummy    56
Giza68 Dummy    64