constant {brms} | R Documentation |

## Constant priors in brms

### Description

Function used to set up constant priors in brms. The function does not evaluate its arguments – it exists purely to help set up the model.

### Usage

```
constant(const, broadcast = TRUE)
```

### Arguments

`const` |
Numeric value, vector, matrix of values to which the parameters should be fixed to. Can also be a valid Stan variable in the model. |

`broadcast` |
Should |

### Value

A named list with elements `const`

and `broadcast`

.

### See Also

### Examples

```
stancode(count ~ Base + Age, data = epilepsy,
prior = prior(constant(1), class = "b"))
# will fail parsing because brms will try to broadcast a vector into a vector
stancode(count ~ Base + Age, data = epilepsy,
prior = prior(constant(alpha), class = "b"),
stanvars = stanvar(c(1, 0), name = "alpha"))
stancode(count ~ Base + Age, data = epilepsy,
prior = prior(constant(alpha, broadcast = FALSE), class = "b"),
stanvars = stanvar(c(1, 0), name = "alpha"))
```

[Package

*brms*version 2.21.0 Index]