Dataset:  lightsat.dat

Source: H. Helson (1942). "Multiple-Variable Analysis of Factors Affecting
Lightness and Saturation," The American Journal of Psychology, Vol.55,
#1,pp46-57

Description: Saturation and Lightness  scores (mean of 18 samples viewed 
by 5 Ss) for 3 backgrounds,
4 Spectral Hues, at 4 Illumination Levels.

Backgrounds:
1=White
2=Gray
3=Black

Hues
1=Red 
2=Yellow 
3=Green 
4=Blue

Intensities (Foot-Candles)
1=135
2=72
3=4.5
4=1.4

Variables/Columns
Intensity     8
Background    16
Hue           24
Saturation Score  29-32
Lighting score    45-48