logit | R Documentation |
Compute the logit transformation of proportions or percentages.
logit(p, percents, adjust)
p |
numeric vector or array of proportions or percentages. |
percents |
|
adjust |
adjustment factor to avoid proportions of 0 or 1;
defaults to |
Computes the logit transformation logit =\log [p/(1-p)]
for the proportion p
.
If p=0
or 1
, then the logit
is undefined. logit
can remap the proportions to the interval
(adjust, 1 - adjust)
prior to the transformation. If it adjusts the data
automatically, logit
will print a warning message.
a numeric vector or array of the same shape and size as p
.
John Fox jfox@mcmaster.ca
Fox, J. and Weisberg, S. (2019) An R Companion to Applied Regression, Third Edition, Sage.
probabilityAxis
save.opt <- options(digits=4)
logit(.1*0:10)
logit(.1*0:10, adjust=0)
options(save.opt)
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