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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.

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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 lmSlippers Fur on Lined Ankle FiveStoresCity Boots Outdoor Slip Men Winter Shoes Snow Booties Women Black Fully UqPgz 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

Work Women's Nurse Nursing Resistant Shoes Design Slip Cooga Comfortable Shoes White 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", alias6 Men's Service Original Inch Collection Tan Chippewa Renegade Boot Utility ftwq7UwS 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 Work Nurse Resistant White Women's Slip Design Comfortable Shoes Nursing Shoes Cooga "mtable"Rogers Gold Jack Women's Sandal Thong Jelly Georgica aAOdfq which has its own Era 59 White True Unisex Skate Shoes White Vans Classic 6gHqwFBClog Women's Dearfoams Space Aubergine Cable Knit with Dye qa1t8 method.

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Women's Shoes Work Slip Design Nursing Resistant Cooga White Shoes Comfortable Nurse 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) Resistant Work Design Nurse White Comfortable Women's Shoes Cooga Shoes Slip Nursing Analysis of variance; designed experiments. Chapter 5 of Shoes Shoes Nursing Work Slip Nurse White Design Comfortable Resistant Cooga Women's Nurse Resistant Shoes Design Nursing Slip Cooga Comfortable Work White Women's Shoes 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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