isNested {lme4} | R Documentation |

## Is f1 nested within f2?

### Description

Does every level of f1 occur in conjunction with exactly one level of f2? The function is based on converting a triplet sparse matrix to a compressed column-oriented form in which the nesting can be quickly evaluated.

### Usage

```
isNested(f1, f2)
```

### Arguments

`f1` |
factor 1 |

`f2` |
factor 2 |

### Value

TRUE if factor 1 is nested within factor 2

### Examples

```
with(Pastes, isNested(cask, batch)) ## => FALSE
with(Pastes, isNested(sample, batch)) ## => TRUE
```

[Package

*lme4*version 1.1-35.5 Index]