Accelerated Life Test Models
main topic

Relationship	Model
Arrhenius	Y = b0 + b1 * [11604.83/° C + 273.16)] + se
Inverse temperature	Y = b0 + b1 * [1/(° C + 273.16)] + se
ln (power)	Y = b0 + b1 * ln(accelerating variable) + se
Linear	Y = b0 + b1 * accelerating variable + se

where:

· Y = failure time or log failure time.

· b0 = y-intercept (constant)

· b1 = regression coefficient

· s = reciprocal of the shape parameter (Weibull distribution) or the scale parameter (other distributions).

· e = random error term.

Note	The slope, b1, is the activation energy in Arrhenius models when the assumed distribution is Weibull, exponential, lognormal, or loglogistic.