Displaying 2 results from an estimated 2 matches for "odoroff".
2006 May 15
0
reproducing scaling used in biplot(pc.biplot=TRUE)
...servations by sqrt(n)" and "divide the loadings of the
principal components by sqrt(n)"? Is 'scale' meaningless for
pc.biplot=TRUE as now the scaling is based on lambda =1 and sqrt(n)
only? What happens when pc.biplot=FALSE
In Details, ?pc.biplot it says "Gabriel and Odoroff (1990) use the
same definitions, but their plots actually correspond to 'pc.biplot =
TRUE'." A little earlier in the help file, it is stated that
pc.biplot=TRUE corresponds to the Gabriel 1971. Are biplots in
Gabriel (1971) and in Gabriel and Odoroff (1990) used identical?
It woul...
2008 Jun 05
3
How to combine to PCAs
Dear all:
Subjects were measured two times (t1 and t2) on different variables (v1 ... vn).
Between t1 and t2 there was an experimental manipulation. I computed two PCAs for time-points t1 and t2.
Is it possible to combine both PCAs in order to get only one set of eigenvectors? Due to the experimental manipulation measurement values on time points t1 and t2 changed for each subject.
Many