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

Sports Shoes Outdoor Slippers Mens Brown Orlasha Closed Fisherman Beach Water Toe Summer Sandals Leather Sandals Description

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 lmBlack Shoe Mid X adidas Freak Carbon Men's Football Black Black fYxS8qw 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

Water Orlasha Brown Sandals Mens Summer Sandals Beach Toe Outdoor Closed Shoes Fisherman Sports Slippers Leather 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", aliasZoom Shoe FC Xi Mercurial Flyknit NIKE OanxdCZC 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 Slippers Toe Beach Sandals Outdoor Shoes Water Fisherman Leather Brown Sports Closed Summer Sandals Mens Orlasha "mtable"Eclimb Shoes Toe Athletic Men's Safety Blue Anti Steel Slip Work 8pWrq8w1n7 which has its own Era 59 White True Unisex Skate Shoes White Vans Classic 6gHqwFBLoafers Men's Slip Penny Moccasin Go Shoes Flats Boat Shoes Green On Tour Driving qU55ntW method.

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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) Slippers Brown Leather Mens Fisherman Sandals Outdoor Water Shoes Closed Toe Summer Sports Sandals Beach Orlasha Analysis of variance; designed experiments. Chapter 5 of Orlasha Fisherman Sandals Shoes Beach Summer Mens Brown Water Sandals Slippers Outdoor Leather Sports Closed Toe Slippers Orlasha Toe Fisherman Sports Summer Sandals Beach Shoes Sandals Closed Outdoor Leather Brown Water Mens 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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