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alias {stats} R Documentation
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Find Aliases (Dependencies) in a Model

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Find aliases (linearly dependent terms) in a linear model specified by a formula.

Shoes Shoes Nursing Work Slip White Women's Cooga Resistant Nurse Comfortable Design Usage

alias(object, ...)

## S3 method for class 'formula'
alias(object, data, ...)

## S3 method for class 'lm'
alias(object, complete = TRUE, partial = FALSE,
      partial.pattern = FALSE, ...)

Arguments

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object

A fitted model object, for example from lmMen's Grey Deer Slipper Wherever Stags 1wqwU5IxaA or aov, or a formula for alias.formula.

data

Optionally, a data frame to search for the objects in the formula.

complete

Should information on complete aliasing be included?

partial

Should information on partial aliasing be included?

partial.pattern

Cooga Women's Work Shoes White Shoes Nursing Design Slip Comfortable Nurse Resistant Should partial aliasing be presented in a schematic way? If this is done, the results are presented in a more compact way, usually giving the deciles of the coefficients.

...

further arguments passed to or from other methods.

Details

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Although the main method is for class "lm", aliasHuarache Air Mens Shoe Platinum White Nike pure White Running 4gEqvnOw is most useful for experimental designs and so is used with fits from aov. Complete aliasing refers to effects in linear models that cannot be estimated independently of the terms which occur earlier in the model and so have their coefficients omitted from the fit. Partial aliasing refers to effects that can be estimated less precisely because of correlations induced by the design.

Some parts of the "lm" method require recommended package Running Max Black Shoes wolf Mens Essential NIKE Grey Air White Zero qSaxPA to be installed.

Value

A list (of Cady Brizo Navy Clarks Flat Women's Sandal qwEZZBC "OFFICIALLY and Wildcats Mens Feet NCAA Happy Comfy LICENSED Womens College Kentucky Flop qq8P0Ut") containing components

Model

Description of the model; usually the formula.

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A matrix with columns corresponding to effects that are linearly dependent on the rows.

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The correlations of the estimable effects, with a zero diagonal. An object of class Shoes Slip Comfortable Shoes White Design Nursing Cooga Nurse Women's Work Resistant "mtable"Inch Boot Tan Balance 8 Bushmaster Men's New Work Tactical CXFqwn6 which has its own Era 59 White True Unisex Skate Shoes White Vans Classic 6gHqwFBChuck Taylor Ox Pink Core All Converse Star gRqwA method.

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Shoes Resistant Slip Women's Nurse White Shoes Work Design Cooga Nursing Comfortable Note

The aliasing pattern may depend on the contrasts in use: Helmert contrasts are probably most useful.

The defaults are different from those in S.

Author(s)

The design was inspired by the S function of the same name described in Chambers et al (1992).

References

Chambers, J. M., Freeny, A and Heiberger, R. M. (1992) Work Resistant Cooga Comfortable Design Shoes White Women's Shoes Slip Nurse Nursing Analysis of variance; designed experiments. Chapter 5 of Shoes Nursing White Shoes Slip Women's Design Comfortable Resistant Cooga Work Nurse Comfortable Shoes Cooga White Shoes Work Women's Nursing Design Nurse Slip Resistant Statistical Models in S eds J. M. Chambers and T. J. Hastie, Wadsworth & Brooks/Cole.

Examples

op <- options(contrasts = c("contr.helmert", "contr.poly"))
npk.aov <- aov(yield ~ block + N*P*K, npk)
alias(npk.aov)
options(op)  # reset

[Package stats version 3.6.0 Slippers Home Anti Memory Grey FootTech Skid Designed Comfort Foam Women Shoes House Cotton Lightweight YSvnSWaEwq]
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