eac_weibull

eac_weibull calculates the unit cost expected equivalent annual cost (or capital reduction factor CRF) when the asset survival function is $$S(t) = \exp\Big[-\Big(\frac{t}{\lambda}\Big)^{\beta}\Big]$$ i.e. a Weibull distribution and the continuous time discount rate is r.

eac_weibull(lifetime, beta, system_age, r)

Arguments

lifetime

mean system lifetime

beta

weibull shape parameter (usually > 1)

system_age

vector of system ages

r

continuous time discount rate

Value

vector of annualised costs assumi