epGPCA {ExPosition} R Documentation

## epGPCA: Generalized Principal Components Analysis (GPCA) via ExPosition.

### Description

Generalized Principal Components Analysis (GPCA) via ExPosition.

### Usage

epGPCA(DATA, scale = TRUE, center = TRUE, DESIGN = NULL, make_design_nominal = TRUE,
masses = NULL, weights = NULL, graphs = TRUE, k = 0)


### Arguments

 DATA original data to perform a PCA on. scale a boolean, vector, or string. See expo.scale for details. center a boolean, vector, or string. See expo.scale for details. DESIGN a design matrix to indicate if rows belong to groups. make_design_nominal a boolean. If TRUE (default), DESIGN is a vector that indicates groups (and will be dummy-coded). If FALSE, DESIGN is a dummy-coded matrix. masses a diagonal matrix or column-vector of masses for the row items. weights a diagonal matrix or column-vector of weights for the column items. graphs a boolean. If TRUE (default), graphs and plots are provided (via epGraphs) k number of components to return.

### Details

epGPCA performs generalized principal components analysis. Essentially, a PCA with masses and weights for rows and columns, respectively.

### Value

See corePCA for details on what is returned. In addition to the values in corePCA:

 M a matrix (or vector, depending on size) of masses for the row items. W a matrix (or vector, depending on size) of weights for the column items.

Derek Beaton

### References

Abdi, H., and Williams, L.J. (2010). Principal component analysis. Wiley Interdisciplinary Reviews: Computational Statistics, 2, 433-459.
Abdi, H. (2007). Singular Value Decomposition (SVD) and Generalized Singular Value Decomposition (GSVD). In N.J. Salkind (Ed.): Encyclopedia of Measurement and Statistics.Thousand Oaks (CA): Sage. pp. 907-912.

corePCA, epPCA, epMDS
	#this is for ExPosition's iris data
gpca.iris.res <- epGPCA(ep.iris$data,DESIGN=ep.iris$design,make_design_nominal=FALSE)