Calculate variance-covariance matrix for a fitted model object.
Arguments
- object
- ...
Other arguments. Not used (needed for generic consistency).
- var_correct
A logical indicating whether to return the corrected variance-covariance matrix for models fit using
ssn_glm()
(whenfamily
is different from"Gaussian"
). The default isTRUE
.
Value
The variance-covariance matrix of coefficients obtained via coef()
.
Currently, only the variance-covariance matrix of the fixed effects is supported.
Examples
# Copy the mf04p .ssn data to a local directory and read it into R
# When modeling with your .ssn object, you will load it using the relevant
# path to the .ssn data on your machine
copy_lsn_to_temp()
temp_path <- paste0(tempdir(), "/MiddleFork04.ssn")
mf04p <- ssn_import(temp_path, overwrite = TRUE)
ssn_mod <- ssn_lm(
formula = Summer_mn ~ ELEV_DEM,
ssn.object = mf04p,
tailup_type = "exponential",
additive = "afvArea"
)
vcov(ssn_mod)
#> (Intercept) ELEV_DEM
#> (Intercept) 38.35386871 -1.902743e-02
#> ELEV_DEM -0.01902743 9.458396e-06