I am experiencing some confusing behavior from gamlss
in R. The documentation lists predict.gamlss and ?predict.gamlss
returns the function documentation in RStudio. However, the function does not autocomplete when typing out predict.gamlss
, and trying to run it returns Error: 'predict.gamlss' is not an exported object from 'namespace:gamlss'
. How does that happen? Is the function deactivated somehow? There is a separate function predictAll
that does work.
The documentation does state
This function is under development
I am trying to access the function because I am experiencing some confusing results with predict
and predictAll
.
R version is 4.0.0. gamlss
version is 5.1.6.
As far as I can tell, what you describe is expected and is normal S3 method dispatching. The method predict.gamlss
is called when you call predict
on a object of class gamlss
.
Consider the following (from the documentation of ?predict.gamlss
)
data(abdom)
aa <- gamlss(y ~ cs(x^.5), data = abdom)
#[1] 371.3931
predict(aa)[610]
Looking at the class of aa
:
class(aa)
#[1] "gamlss" "gam" "glm" "lm"
The function is not exported, but the S3 method is registered.
As to the difference between predictAll
and predict.gamlss
, you'll have to read the documentation (the two are documented together). My guess is that predictAll
predict all listed in the what
-argument of predict.gamlss
.