calculate.fitted_life_data: Calculate Metrics From Fitted Distribution
In lxy009/weibullpp: weibullpp

calculate various values based on input and fitted distribution

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## S3 method for class 'fitted_life_data'
calculate(x, value, input = NA, cond_input = NA,
  alpha = 0.05)

`x`	a fitted_life_data object
`value`	desired metric. see details
`input`	numeric input for certain values. ignored if not needed.
`cond_input`	input for conditional probability calculations. ignored otherwise.
`alpha`	alpha level for bounds

Values for value input

reliability	reliability value at input. Prob(T>input)
failure	probability of failure by input. Prob(T<input)
mean life	mean of fitted distribution
failure rate	failure/hazard at input. Prob(T=input+delta\|T>input)
reliable life	t for Prob(T>t) = input
bx life	t for Prob(T<t) = input
cond reliab	Prob(T>input+cond_input\|T>cond_input)
cond fail	Prob(T<input+cond_input\|T>cond_input)