# isNested

From lme4 v1.1-21
by Ben Bolker

##### Is f1 nested within f2?

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

```
# NOT RUN {
with(Pastes, isNested(cask, batch)) ## => FALSE
with(Pastes, isNested(sample, batch)) ## => TRUE
# }
```

*Documentation reproduced from package lme4, version 1.1-21, License: GPL (>= 2)*

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