Description Usage Arguments Details Value See Also Examples

This function finds the labels of coefficients associated with interactions or main effects in the results of various model fitting functions.

1 |

`model` |
a model object. |

`ef` |
a character string (a coefficent label). |

`order` |
a character string vector giving the order of the
terms to be returned.
One of |

`include.base` |
logical. Should the labels in |

`model`

is an object returned by a model fitting
function (e.g., `lm`

, `aov`

).

The character string passed to `ef`

must not include the
intercept (`"(Intercept)"`

) since it cannot be part of an
interaction. All non-intercept labels of any order are allowed.

If `order`

is `"higher"`

, all terms of a higher order
are returned. If `order`

is `"lower"`

, all terms of a
lower order are returned. If `order`

is `"all"`

then
both terms of lower and higher order are returned. For example,
if a model fit has the terms `A`

, `B`

, `C`

,
`A:B`

, `B:C`

, `A:C`

, and `A:B:C`

, terms of
higher order relative to `A`

are `A:B`

, `A:C`

,
and `A:B:C`

. Terms of lower order relative to `A:B`

are
`A`

and `B`

.

If `include.base`

is `FALSE`

(the default), the term
label in `ef`

is not part of the returned string vector.

`asef`

returns vectors of character strings
(coefficent labels).

`terms`

for extracting model terms.

1 2 3 4 5 6 7 8 9 10 11 12 13 | ```
require(utils)
data(iris)
fit <- lm(Sepal.Length ~ Sepal.Width * Petal.Length * Petal.Width, data = iris)
asef(fit, "Petal.Length:Petal.Width", order = "higher")
asef(fit, "Sepal.Width:Petal.Length:Petal.Width", order = "lower")
asef(fit, "Petal.Length:Petal.Width", order = "all")
data(warpbreaks)
fit2 <- lm(breaks ~ wool * tension, data = warpbreaks)
# Since wool is a factor, the coefficient has another name, "woolB"
asef(fit2, "woolB", order = "higher")
asef(fit2, "woolB", order = "higher", include.base = TRUE)
``` |

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