# delete.response

##### Modify Terms Objects

`delete.response`

returns a `terms`

object for the same
model but with no response variable.

`drop.terms`

removes variables from the right-hand side of the
model. There is also a `"[.terms"`

method to perform the same
function (with `keep.response = TRUE`

).

`reformulate`

creates a formula from a character vector.

- Keywords
- programming

##### Usage

`delete.response(termobj)`reformulate(termlabels, response = NULL, intercept = TRUE)

drop.terms(termobj, dropx = NULL, keep.response = FALSE)

##### Arguments

- termobj
- A
`terms`

object - termlabels
- character vector giving the right-hand side of a model formula. Cannot be zero-length.
- response
- character string, symbol or call giving the left-hand side of
a model formula, or
`NULL`

. - intercept
- logical: should the formula have an intercept?
- dropx
- vector of positions of variables to drop from the right-hand side of the model.
- keep.response
- Keep the response in the resulting object?

##### Value

`delete.response`

and`drop.terms`

return a`terms`

object.`reformulate`

returns a`formula`

.

##### See Also

##### Examples

`library(stats)`

```
ff <- y ~ z + x + w
tt <- terms(ff)
tt
delete.response(tt)
drop.terms(tt, 2:3, keep.response = TRUE)
tt[-1]
tt[2:3]
reformulate(attr(tt, "term.labels"))
## keep LHS :
reformulate("x*w", ff[[2]])
fS <- surv(ft, case) ~ a + b
reformulate(c("a", "b*f"), fS[[2]])
## using non-syntactic names:
reformulate(c("`P/E`", "`% Growth`"), response = as.name("+-"))
stopifnot(identical( ~ var, reformulate("var")),
identical(~ a + b + c, reformulate(letters[1:3])),
identical( y ~ a + b, reformulate(letters[1:2], "y"))
)
```

*Documentation reproduced from package stats, version 3.3, License: Part of R 3.3*

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