Principal component analysis – Multichannel Systems NeuroExplorer User Manual
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2.25. Principal Component Analysis
This analysis calculates eigenvalues and eigenvectors (principal components) of the matrix of
correlations of rate histograms. The analysis creates
corresponding to the principal
components.
Parameters
Parameter
Description
Bin
Bin size in seconds.
Vectors Prefix
A string specifying how the population vector names will be generated. For
example, if prefix is pca1, the vector names will be pca1_01, pca1_02,
etc.
Select Data
If Select Data is From Time Range, only the data from the specified (by
Select Data From and Select Data To parameters) time range will be used
in analysis. See also
.
Select Data From
Start of the time range in seconds.
Select Data To
End of the time range in seconds.
Interval filter
Specifies the interval filter that will be used to preselect data before
analysis. See also
Send to Matlab
An option to send the matrix of numerical results to Matlab. See also
.
Matrix Name
Specifies the name of the results matrix in Matlab workspace.
Matlab command
Specifies a Matlab command that is executed after the numerical results
are sent to Matlab.
Send to Excel
An option to send numerical results or summary of numerical results to
Excel. See also
Sheet Name
The name of the worksheet in Excel where to copy the numerical results.
TopLeft
Specifies the Excel cell where the results are copied. Should be in the form
CR where C is Excel column name, R is the row number. For example, A1
is the top-left cell in the worksheet.
Summary of Numerical Results
The following information is available in the Summary of Numerical Results
Column
Description
Variable
Variable name and PCA statistics name.
pca1_N
The weight of the variable in the N-th eigenvector. The rows at the bottom
of the table also show Eigenvalue of this eigenvector, % of variance it
explains, and the cumulative percent of the variance explained by this and
preceding eigenvectors.
Corr with VAR
Correlation with the specified variable.
Numerical Results
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