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Communalities indicate the amount of variance in each
variable that is accounted for.
Initial communalities are
estimates of the variance in each variable accounted for by
all components or factors. For principal components extraction,
this is always equal to 1.0 for correlation analyses.
Extraction communalities are estimates of the variance in
each variable accounted for by the components.
The communalities in this table are all high, which
indicates that the extracted components represent
the variables well. If any communalities are very low in a
principal components extraction, you may need to extract
another component.
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Communalities |