Principal Component Analysis

Author: O.Conrad (c) 2010
Menu: Spatial and Geostatistics | Grids | Principal Components

Description

Principal Component Analysis (PCA) for grids. PCA implementation is based on F.Murtagh's code as provided by the StatLib web site.

References

StatLib Web Site
C-code by F.Murtagh
Bahrenberg, G., Giese, E., Nipper, J. (1992): Statistische Methoden in der Geographie 2 - Multivariate Statistik. pp.198-277.

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Grids	grid list, input	`GRIDS`	-	-
Input	Eigen Vectors	table, input, optional	`EIGEN_INPUT`	Use Eigen vectors from this table instead of calculating these from the input grids.	-
Output	Principal Components	grid list, output	`PCA`	-	-
Output	Eigen Vectors	table, output, optional	`EIGEN`	Store calculated Eigen vectors to this table, e.g. for later use with forward or inverse PCA.	-
Options	Grid System	grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Method	choice	`METHOD`	-	Available Choices: [0] correlation matrix [1] variance-covariance matrix [2] sums-of-squares-and-cross-products matrix Default: 1
	Number of Components	integer number	`COMPONENTS`	number of first components in the output; set to zero to get all	Minimum: 0 Default: 3
	Overwrite Previous Results	boolean	`OVERWRITE`	-	Default: 1

Command Line


Usage: saga_cmd statistics_grid 8 [-GRIDS ] [-PCA ] [-EIGEN_INPUT ] [-EIGEN ] [-METHOD ] [-COMPONENTS ] [-OVERWRITE ]
  -GRIDS:      	Grids
	grid list, input
  -PCA:        	Principal Components
	grid list, output
  -EIGEN_INPUT:	Eigen Vectors
	table, input, optional
  -EIGEN:      	Eigen Vectors
	table, output, optional
  -METHOD:     	Method
	choice
	Available Choices:
	[0] correlation matrix
	[1] variance-covariance matrix
	[2] sums-of-squares-and-cross-products matrix
	Default: 1
  -COMPONENTS: 	Number of Components
	integer number
	Minimum: 0
	Default: 3
  -OVERWRITE:  	Overwrite Previous Results
	boolean
	Default: 1