Calculates the logit (log-odds) and inverse-logit.
Arguments
- mu
A numeric object with probabilies, with values in the in
the range [0,1]. Missing values (NAs) are allowed.
- eta
A numeric object with log-odds values, with values in
the range [-Inf,Inf]. Missing values (NAs) are allowed.
Value
A numeric object of the same type as mu and eta containing
the logits or inverse logit of the input values. The logit and
inverse transformation equates to
$$\mbox{logit}(\mu) = \log(\mu/(1-\mu))$$
$$\mbox{logit}^{-1}(\eta)= \exp(\eta)/(1 + \exp(\eta)).$$
Details
Values of mu equal to 0 or 1 will return -Inf or Inf
respectively.
Examples
logit(0.2)
#> [1] -1.386294
inv_logit(-1.386)
#> [1] 0.2000471