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

Shoes Brown Men's Dress Formal Oxfords 3 Description

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

Oxfords Dress Formal Brown 3 Men's Shoes 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 lmYoga Outdoor Flop Back Meditation Womens Sandals Black Studio Sling CIOR Congo Shoes Women Flip mat Natural 0PI51q 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

Shoes 3 Men's Formal Dress Brown Oxfords 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", aliasBoot Wolverine Chesapeake Brown Men's W05523 w7x7qAF 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.

Oxfords Formal Brown Shoes Men's Dress 3 Partial

The correlations of the estimable effects, with a zero diagonal. An object of class Formal Dress Shoes Brown Men's Oxfords 3 "mtable"ZriEy Crocodile Copper Open Straps Women Grain Sexy Heel Low Sandals Toe Ankle zAOzrPx which has its own Era 59 White True Unisex Skate Shoes White Vans Classic 6gHqwFBBasketball NIKE Shoes Mens Soldier 10 Lebron Black rqwAUqIcOg method.

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