Speedometer cables can be noisy because of shrinkage in the plastic casing material. An experiment was conducted to find out what caused shrinkage by screening a large number of factors. The engineers started with 15 different factors.
data(speedo)The dataset contains the following variables: (variables a-o are 2 level factors, coded "+" and "-" where "+" indicates a higher value where appropriate)
aliner outer diameter
bliner die
cliner material
dliner line speed
ewire braid type
fbraiding tension
gwire diameter
hliner tension
iliner temperature
jcoating material
kcoating die type
lmelt temperature
mscreen pack
ncooling method
oline speed
ypercentage shrinkage per specimen