Parameter

Estimated value

S.E.

With Frailty

22.4010

0.1980

p

2.9369

0.0085

0.3700

0.0125

0.5444

0.0054

Average tensile strength

2.6569

0.0981

Without Frailty

20.0254

0.5625

p

2.7869

0.2134

Average tensile strength

2.6096

0.1013