Table 3.

R² values of linear, exponential, logarithmic, and quadratic curves of all materials

Material	Linear	Exponential	Logarithmic	Quadratic
VE	.965	.966	.957	.976
LS	.953	.944	.997	.996
LU	.963	.978	.983	.984
TE	.986	.985	.980	.993
SU	.976	.982	.994	.997
CD	.918	.975	.987	.985