logit and inverse logit (expit) functions
logit and inverse logit (expit) functions
logit(x, low = 0, high = 1) expit(alpha, low = 0, high = 1) logitNormInfo(mean = 0, sd = 1, low = 0, high = 1, abs.tol = 1e-06, ...) probitNormInfo(mean = 0, sd = 1, low = 0, high = 1, abs.tol = 1e-06, ...)
x |
Input value(s) in range [low,high] to translate -Inf to Inf |
low |
Lowest value in the range |
high |
Highest value in the range |
alpha |
Infinite value(s) to translate to range of [low, high] |
mean |
logit-scale mean |
sd |
logit-scale standard deviation |
abs.tol |
absolute accuracy requested. |
... |
other parameters passed to |
logit is given by:
logit(p) = -log(1/p-1)
where:
p = x-low/high-low
expit is given by:
expit(p, low, high) = (high-low)/(1+exp(-alpha)) + low
The logitNormInfo() gives the mean, variance and coefficient of
variability on the untransformed scale.
values from logit and expit
logit(0.25) expit(-1.09) logitNormInfo(logit(0.25),sd=0.1) logitNormInfo(logit(1,0,10), sd=1, low=0, high=10)
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