John, right click on the plot, select "scale
factor" (the PC score you're visualizing) and
change its sign (from 0.1 to -0.1 or whatever the
score is): you'll see the opposite extreme of variation on that axis.
TPSRelw (for 2D data) and Morphologika can be
more intuitive on this, as you simply drag the
pointer on the PC scatterplot and visualize the corresponding shape.
In general, on the visualization, I suggest
people to read Klingenberg's 2013 Hystrix paper:
http://www.italian-journal-of-mammalogy.it/article/view/7691
Cheers
Andrea
At 16:26 04/08/2015, you wrote:
While the polarity of PCA is arbitrary, vectors
showing PCA variability at landmarks show
relationships among those landmarks. E.g., (if the mono-spaced font works)...
-----O
    O-----
vs.
-----O-----
-----O-----
-ds
On Tuesday, August 4, 2015 at 10:19:53 AM UTC-4, John O'Connor wrote:
Hi everyone,
I'm starting out with Morphometrics so this is
probably a basic question. Can anyone tell me
why the Lollipop graphs produced by MorphoJ
(showing a dot and a line with the dot usually
being the mean) only show one direction, should
there not be variation on the other in two
directions to represent +/- variations?
Thanks in advance
John O'Connor
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