Dataset:  arrowhead_clothing.csv

Source: N. MacPhee, A. Savage, N. Noton, E. Beattie, L. Milne, J. Fraser (2018).
"A Comparison of Penetration and Damage Caused by Different Types of 
Arrowheads on Loose and Tight Fitting Clothing," Science & Justice,
Vol. 58, pp. 109-120.

Description: Experiment comparing penetration of 4 types of arrowheads 
through 3 fabric types and 2 clothing fits.
Arrowhead Types: 1=Bullet, 2=Judo, 3=Broadhead (Blunt excluded due to low Y's)
Clothing Fits: 1=Tight, 2=Loose
Fabric Types: 1=T-shirt (95% Cotton), 2=Jeans (65% Cttn), 3=Jeans (95% Cttn)
Authors fit 2-factor ANOVAs seperately by arrowhead type.

Variable names:
arrowhead
clothFit
clothType
pntrt (cm)