Compares the variance of observed data to the variance expected under
the fitted model (via simulation). Ratio > 1 = overdispersion;
< 1 = underdispersion. Equivalent to DHARMa::testDispersion().
Usage
test_dispersion(object, ...)
# Default S3 method
test_dispersion(
object,
observed = NULL,
nsim = 250L,
seed = 123L,
alternative = c("two.sided", "greater", "less"),
...
)Arguments
- object
A fitted model with
simulate()method- ...
Passed to methods.
- observed
Observed response vector (optional – extracted from fit)
- nsim
Number of simulations (default 250)
- seed
Random seed (default 123)
- alternative
"two.sided","greater", or"less"