PiscesLogoSmallerStill  Variance - PCA

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This form presents in the first column the eigenvalues of the dispersion (correlation or variance-covariance) matrix arranged from largest to smallest. In the second column the cumulative total of the eigenvalues is given. The third column, labeled % of Total Variance, gives the cumulative total of the eigenvalues presented as a percentage of the total sum of the eigenvalues. This gives the total variance in the dispersal matrix represented by the cumulative total magnitude of the eigenvalues. If the relationship between the samples (columns) is to be usefully represented by a small number of axes, then the first 3 or 4 eigenvalues should represent a large proportion of the total variance. The amount of the total % variance represented can be seen in the fourth column.

 

pca variance2

 

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