In running factor analyses in SPSS, I have noticed that
there are no values for % of variance and cumulative % of variance for Rotation
Sums of Squared Loadings when using an oblique rotation (such as promax or
direct oblimin). The total, %, and cumulative % are there for initial and
extraction, but only total for rotation. In contrast, when using orthogonal
varimax rotation, total, %, and cumulative are present for the initial,
extraction, and rotation solutions.
Is this because there are variable proportions of variance when
using an oblique rotation but only one for an orthogonal one?
Also, under these circumstances, presumably the total amount
of variance is the same as the extraction SSLs, but does this mean that no
percentages can be reported for the individual factors?
Any addition clarification about this would be great.
Thanks,
James MacKillop
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