For non-repairable items MTTF = total operating time / number of failures. The
MTTF is the expected time to the first failure. It is commonly used for non-repairable items.
The behavior implemented is the same as mtbf here; keep separate name for semantic clarity.
Usage
mttf(failures, totalTime)
Arguments
- failures
Numeric scalar or numeric vector of failure counts (non-negative).
- totalTime
Numeric scalar or numeric vector of total operating times.
Value
Numeric scalar: MTTF. If number of failures is zero, returns Inf (with a warning).
Examples
mttf(5, 1000)
#> [1] 200
mttf(c(2,3), c(500,500))
#> [1] 200
