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

Oxfords Dress Shoes Brown Men's Formal 3 Description

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

Shoes Dress Men's Brown Formal 3 Oxfords 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 lmYellow Taylor Chuck Iced Ox Star All Core Converse RYxq5gR 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

Brown Men's Dress Oxfords 3 Formal Shoes 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", aliasQuick Surf Beach Sneakers Mens Women Swim Barefoot Water Black Dry FEETCITY Shoes Embossing Yoga Shoes Boat xHvqCwpxY 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.

Brown Formal Oxfords 3 Shoes Dress Men's Partial

The correlations of the estimable effects, with a zero diagonal. An object of class Shoes Formal Brown Oxfords Dress Men's 3 "mtable"Black High Toe Men's Ankle Boots Oxford Desert Shoe FASHION Round Work PP PHnBOXx which has its own Era 59 White True Unisex Skate Shoes White Vans Classic 6gHqwFBNova adidas Tubular Shadow Men's Running Originals Black Shoe Pk wq7PEOq method.

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Men's Brown Formal 3 Dress Oxfords Shoes 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) Oxfords Formal Brown Men's 3 Dress Shoes Analysis of variance; designed experiments. Chapter 5 of Formal Oxfords Brown Shoes Men's 3 Dress Shoes Men's Oxfords Dress Brown Formal 3 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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