RAM	Reliability Availability and Maintainability
MTTF	Mean Time To Fail
TTF	Total Time to Fail
weib	Weibull Distribution
exp	Exponential Distribution
lognor	Log Normal Distribution
cdf	Cumulative Density Function
pdf	Probability Density Function
f(t)	pdf of random variable
F(t)	cdf for a system
h(t)	Hazard Function
$\lambda \left(t\right)$	failure rate
MLE	Maximum Likelihood Estimation
Std	Standard Error
CI	Confidence Intervals
Pr	Probability
nor	Normal
$\eta$	eta, Weibull scale parameter
$\beta$	beta, Weibull distribution shape parameter
sev	Survival, smallest extreme value distribution
ssev	indicates a standard smallest extreme value distribution
$\Phi$	cdf for a standardized location-scale distribution
$\varphi$	pdf for a standardized location-scale distribution
$\sigma$	sigma, scale parameter for a location-scale distribution
$\mu$	mu, location parameter of a location-scale distribution
$\gamma$	gamma, threshold parameter of the distribution function of T
y	unrestricted random variable or a dummy variable
z	standard random variable