Compute posterior draws of the linear predictor, that is draws before
applying any link functions or other transformations. Can be performed for
the data used to fit the model (posterior predictive checks) or for new data.

```
# S3 method for brmsfit
posterior_linpred(
object,
transform = FALSE,
newdata = NULL,
re_formula = NULL,
re.form = NULL,
resp = NULL,
dpar = NULL,
nlpar = NULL,
incl_thres = NULL,
ndraws = NULL,
draw_ids = NULL,
sort = FALSE,
...
)
```

## Arguments

- object
An object of class `brmsfit`

.

- transform
Logical; if `FALSE`

(the default), draws of the linear predictor are returned.
If `TRUE`

, draws of the transformed linear predictor,
that is, after applying the inverse link function are returned.

- newdata
An optional data.frame for which to evaluate predictions. If
`NULL`

(default), the original data of the model is used.
`NA`

values within factors are interpreted as if all dummy
variables of this factor are zero. This allows, for instance, to make
predictions of the grand mean when using sum coding.

- re_formula
formula containing group-level effects to be considered in
the prediction. If `NULL`

(default), include all group-level effects;
if `NA`

, include no group-level effects.

- re.form
Alias of `re_formula`

.

- resp
Optional names of response variables. If specified, predictions
are performed only for the specified response variables.

- dpar
Name of a predicted distributional parameter
for which draws are to be returned. By default, draws
of the main distributional parameter(s) `"mu"`

are returned.

- nlpar
Optional name of a predicted non-linear parameter.
If specified, expected predictions of this parameters are returned.

- incl_thres
Logical; only relevant for ordinal models when
`transform`

is `FALSE`

, and ignored otherwise. Shall the
thresholds and category-specific effects be included in the linear
predictor? For backwards compatibility, the default is to not include them.

- ndraws
Positive integer indicating how many posterior draws should
be used. If `NULL`

(the default) all draws are used. Ignored if
`draw_ids`

is not `NULL`

.

- draw_ids
An integer vector specifying the posterior draws to be used.
If `NULL`

(the default), all draws are used.

- sort
Logical. Only relevant for time series models.
Indicating whether to return predicted values in the original
order (`FALSE`

; default) or in the order of the
time series (`TRUE`

).

- ...
Further arguments passed to `prepare_predictions`

that control several aspects of data validation and prediction.

## Examples

```
if (FALSE) {
## fit a model
fit <- brm(rating ~ treat + period + carry + (1|subject),
data = inhaler)
## extract linear predictor values
pl <- posterior_linpred(fit)
str(pl)
}
```