Category

Model Equation

R2

R a d j 2

Low (0 - 4)

Y(t) = 0.135441 − 0.308532 (1/t) − 0.002030ln(lnt)

0.9576

0.9566

Medium (4 - 7)

Y(t) = 0.169518 − 0.356821(1/t) − 0.007011ln(lnt)

0.962

0.961

High (7 - 10)

Y(t) = 0.191701 − 0.383521 (1/t) − 0.00358ln(lnt)

0.9588

0.9577