<Li> R (t) = 1 − F (t). (\ displaystyle R (t) = 1 - F (t).) </Li> <Li> R (t) = exp ⁡ (− λ t). (\ displaystyle R (t) = \ exp (- \ lambda t).) (where λ (\ displaystyle \ lambda) is the failure rate) </Li>

For high reliability you want reliability coefficients to be positive and as close as possible to 1