Compute Allowed Changes in Adding to or Dropping from a... (original) (raw)
| factor.scope {stats} | R Documentation |
|---|
Description
add.scope and drop.scope compute those terms that can be individually added to or dropped from a model while respecting the hierarchy of terms.
Usage
add.scope(terms1, terms2)
drop.scope(terms1, terms2)
factor.scope(factor, scope)
Arguments
| terms1 | the terms or formula for the base model. |
|---|---|
| terms2 | the terms or formula for the upper (add.scope) or lower (drop.scope) scope. If missing for drop.scope it is taken to be the null formula, so all terms (except any intercept) are candidates to be dropped. |
| factor | the "factor" attribute of the terms of the base object. |
| scope | a list with one or both components drop andadd giving the "factor" attribute of the lower and upper scopes respectively. |
Details
factor.scope is not intended to be called directly by users.
Value
For add.scope and drop.scope a character vector of terms labels. For factor.scope, a list with componentsdrop and add, character vectors of terms labels.
See Also
[add1](../../stats/help/add1.html), [drop1](../../stats/help/drop1.html),[aov](../../stats/help/aov.html), [lm](../../stats/help/lm.html)
Examples
add.scope( ~ a + b + c + a:b, ~ (a + b + c)^3)
# [1] "a:c" "b:c"
drop.scope( ~ a + b + c + a:b)
# [1] "c" "a:b"
[Package _stats_ version 4.6.0 Index]