Returns the formula(s) for the different parts of a model (like fixed or random effects, zero-inflated component, ...).
A fitted model.
Currently not used.
A list of formulas that describe the model. For simple models,
only one list-element,
conditional, is returned. For more complex
models, the returned list may have following elements:
conditional, the "fixed effects" part from the model. One exception are
DirichletRegModel models from DirichletReg, which has two or three components, depending on
random, the "random effects" part from the model (or the
id for gee-models and similar)
zero_inflated, the "fixed effects" part from the zero-inflation component of the model
zero_inflated_random, the "random effects" part from the zero-inflation component of the model
dispersion, the dispersion formula
instruments, for fixed-effects regressions like
plm, the instrumental variables
cluster, for fixed-effects regressions like
felm, the cluster specification
correlation, for models with correlation-component like
gls, the formula that describes the correlation structure
slopes, for fixed-effects individual-slope models like
feis, the formula for the slope parameters
DirichletRegModel models from DirichletReg, when parametrization (i.e.
For models of class
gls the correlation-component
is only returned, when it is explicitly defined as named argument
corAR1(form = ~1 | Mare)
#> $conditional #> mpg ~ wt + cyl + vs #> <environment: 0x0000000029bf04d0> #>