Formula manipulation | R Documentation |

`simplify.formula`

rewrites a `formula`

into shorthand notation.
Currently only the factor crossing operator `*`

is applied, so an
expanded expression such as `a+b+a:b`

becomes `a*b`

.
`expand.formula`

does the opposite, additionally expanding other
expressions, i.e. all nesting (`/`

), grouping and `^`

.

```
simplify.formula(x)
expand.formula(x)
```

`x` |
a |

Kamil Bartoń

`formula`

`delete.response`

, `drop.terms`

, and
`reformulate`

```
simplify.formula(y ~ a + b + a:b + (c + b)^2)
simplify.formula(y ~ a + b + a:b + 0)
expand.formula(~ a * b)
```

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