ngrps {lme4} | R Documentation |

## Number of Levels of a Factor or a "merMod" Model

### Description

Returns the number of levels of a `factor`

or a set of
factors, currently e.g., for each of the grouping factors of
`lmer()`

, `glmer()`

, etc.

### Usage

```
ngrps(object, ...)
```

### Arguments

`object` |
an |

`...` |
currently ignored. |

### Details

Currently there are methods for objects of class
`merMod`

, i.e., the result of `lmer()`

etc,
and `factor`

objects.

### Value

The number of levels (of a factor) or vector of number of levels for each “grouping factor” of a

### Examples

```
ngrps(factor(seq(1,10,2)))
ngrps(lmer(Reaction ~ 1|Subject, sleepstudy))
## A named vector if there's more than one grouping factor :
ngrps(lmer(strength ~ (1|batch/cask), Pastes))
## cask:batch batch
## 30 10
methods(ngrps) # -> "factor" and "merMod"
```

[Package

*lme4*version 1.1-35.5 Index]