xfit {rchemo}

Matrix fitting from a PCA or PLS model

Description

Function xfit calculates an approximate of matrix X (X_fit) from a PCA or PLS fitted on X.

Function xresid calculates the residual matrix E = X - X_fit.

Usage

xfit(object, X, ...)

## S3 method for class 'Pca'
xfit(object, X, ..., nlv = NULL) 

## S3 method for class 'Plsr'
xfit(object, X, ..., nlv = NULL) 

xresid(object, X, ..., nlv = NULL)

Arguments

object

A fitted model, output of a call to a fitting function.

X

The X-data that was used to fit the model object.

nlv

Number of components (PCs or LVs) to consider.

...

Optional arguments.

Value

For xfitmatrix of fitted values

For xresidmatrix of residuals

Examples

n <- 6 ; p <- 4
X <- matrix(rnorm(n * p), ncol = p)
y <- rnorm(n)

nlv <- 3
fm <- pcasvd(X, nlv = nlv)
xfit(fm, X)
xfit(fm, X, nlv = 1)
xfit(fm, X, nlv = 0)

X - xfit(fm, X)
xresid(fm, X)

X - xfit(fm, X, nlv = 1)
xresid(fm, X, nlv = 1)