Provide additional information on the response variable
in brms models, such as censoring, truncation, or
known measurement error. Detailed documentation on the use
of each of these functions can be found in the Details section
of `brmsformula`

(under "Additional response information").

```
resp_se(x, sigma = FALSE)
resp_weights(x, scale = FALSE)
resp_trials(x)
resp_thres(x, gr = NA)
resp_cat(x)
resp_dec(x)
resp_cens(x, y2 = NA)
resp_trunc(lb = -Inf, ub = Inf)
resp_mi(sdy = NA)
resp_index(x)
resp_rate(denom)
resp_subset(x)
resp_vreal(...)
resp_vint(...)
```

- x
A vector; Ideally a single variable defined in the data (see Details). Allowed values depend on the function:

`resp_se`

and`resp_weights`

require positive numeric values.`resp_trials`

,`resp_thres`

, and`resp_cat`

require positive integers.`resp_dec`

requires`0`

and`1`

, or alternatively`'lower'`

and`'upper'`

.`resp_subset`

requires`0`

and`1`

, or alternatively`FALSE`

and`TRUE`

.`resp_cens`

requires`'left'`

,`'none'`

,`'right'`

, and`'interval'`

(or equivalently`-1`

,`0`

,`1`

, and`2`

) to indicate left, no, right, or interval censoring.`resp_index`

does not make any requirements other than the value being unique for each observation.- sigma
Logical; Indicates whether the residual standard deviation parameter

`sigma`

should be included in addition to the known measurement error. Defaults to`FALSE`

for backwards compatibility, but setting it to`TRUE`

is usually the better choice.- scale
Logical; Indicates whether weights should be scaled so that the average weight equals one. Defaults to

`FALSE`

.- gr
A vector of grouping indicators.

- y2
A vector specifying the upper bounds in interval censoring. Will be ignored for non-interval censored observations. However, it should NOT be

`NA`

even for non-interval censored observations to avoid accidental exclusion of these observations.- lb
A numeric vector or single numeric value specifying the lower truncation bound.

- ub
A numeric vector or single numeric value specifying the upper truncation bound.

- sdy
Optional known measurement error of the response treated as standard deviation. If specified, handles measurement error and (completely) missing values at the same time using the plausible-values-technique.

- denom
A vector of positive numeric values specifying the denominator values from which the response rates are computed.

- ...
For

`resp_vreal`

, vectors of real values. For`resp_vint`

, vectors of integer values. In Stan, these variables will be named`vreal1`

,`vreal2`

, ..., and`vint1`

,`vint2`

, ..., respectively.

A list of additional response information to be processed further by brms.

These functions are almost solely useful when
called in formulas passed to the brms package.
Within formulas, the `resp_`

prefix may be omitted.
More information is given in the 'Details' section
of `brmsformula`

(under "Additional response information").

It is highly recommended to use a single data variable as input
for `x`

(instead of a more complicated expression) to make sure all
post-processing functions work as expected.

```
if (FALSE) {
## Random effects meta-analysis
nstudies <- 20
true_effects <- rnorm(nstudies, 0.5, 0.2)
sei <- runif(nstudies, 0.05, 0.3)
outcomes <- rnorm(nstudies, true_effects, sei)
data1 <- data.frame(outcomes, sei)
fit1 <- brm(outcomes | se(sei, sigma = TRUE) ~ 1,
data = data1)
summary(fit1)
## Probit regression using the binomial family
n <- sample(1:10, 100, TRUE) # number of trials
success <- rbinom(100, size = n, prob = 0.4)
x <- rnorm(100)
data2 <- data.frame(n, success, x)
fit2 <- brm(success | trials(n) ~ x, data = data2,
family = binomial("probit"))
summary(fit2)
## Survival regression modeling the time between the first
## and second recurrence of an infection in kidney patients.
fit3 <- brm(time | cens(censored) ~ age * sex + disease + (1|patient),
data = kidney, family = lognormal())
summary(fit3)
## Poisson model with truncated counts
fit4 <- brm(count | trunc(ub = 104) ~ zBase * Trt,
data = epilepsy, family = poisson())
summary(fit4)
}
```