Input file:
X1 X2 X3
1. 1. 0.
1. 1. 1.
1. 1. 2.
0. 0. 0.
0. 0. 1.
Experiment:
<operator name="Root" class="Process" expanded="yes">
<operator name="ExampleSource" class="ExampleSource">
<parameter key="attributes" value="C:\Documents and Settings\Victor\My Documents\test_pca\input.aml"/>
</operator>
<operator name="PCA" class="PCA">
</operator>
<operator name="ModelApplier" class="ModelApplier">
<list key="application_parameters">
</list>
<parameter key="keep_model" value="true"/>
</operator>
<operator name="CSVExampleSetWriter" class="CSVExampleSetWriter">
<parameter key="column_separator" value=","/>
<parameter key="csv_file" value="C:\Documents and Settings\Victor\My Documents\test_pca\output.csv"/>
</operator>
</operator>
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
PC 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 ...
