"Bug in PCA operator output"
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Input file:
X1 X2 X3
1. 1. 0.
1. 1. 1.
1. 1. 2.
0. 0. 0.
0. 0. 1.
Experiment:
The log shows:
Principal Components:
Variance Threshold: 0.95
PC 1: + 0.439 * X1 - 0.554 * X2 + 0.707 * X3
PC 2: + 0.439 * X1 - 0.554 * X2 - 0.707 * X3
电脑3:+ 0.784 * X1 + 0.621 * X2 -0.000 * X3
(created by PCA)
I think the correct components are transpose of this, so the log should show:
PC1 = 0.439*X1 + 0.439*X2 + 0.784*X3
Pc2 = -0.554*X1 - 0.554*X2 ...
X1 X2 X3
1. 1. 0.
1. 1. 1.
1. 1. 2.
0. 0. 0.
0. 0. 1.
Experiment:
The log shows:
Principal Components:
Variance Threshold: 0.95
PC 1: + 0.439 * X1 - 0.554 * X2 + 0.707 * X3
PC 2: + 0.439 * X1 - 0.554 * X2 - 0.707 * X3
电脑3:+ 0.784 * X1 + 0.621 * X2 -0.000 * X3
(created by PCA)
I think the correct components are transpose of this, so the log should show:
PC1 = 0.439*X1 + 0.439*X2 + 0.784*X3
Pc2 = -0.554*X1 - 0.554*X2 ...
0
Answers
The PCA matrix on the screen (tab Eigenvectors view) is displayed correctly.
The next step, model applier, also uses the correct values.
thanks for sending this in. And especially for the additional note - I got a slight shock before you mentioned that it is only transposed in the log out. Puh...
I have changed the logging output and the fixed version is available via CVS in a few hours.
Cheers,
Ingo