Information Technology Reference
In-Depth Information
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SPR
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PLF
Figure 2.14
The biplot of Figure 2.5 with orthogonal parallel translation rotated such
that the
SPR
-axis is horizontal, similar to the first Cartesian axis of a scatterplot.
to give simple values of the variables
SPR
(0) and
SLF
(0) by making the following
changes in the call to
PCAbipl
:
orthog.transx = rep(4.4, 4), orthog.transy = rep(-1.275, 4),
exp.factor = 1.55
We may go further, and note that the projections are unaffected if the whole
figure is rotated through any angle, as has been done in Figure 2.14 by specifying
rotate.degrees = 162.7
in the function call to
PCAbipl
. We can also reflect the
configuration about the horizontal scaffolding axis (by setting argument
reflect =
"x"
) or the vertical scaffolding axis (by setting argument
reflect = "y"
). This has
been done in Figure 2.15 by specifying
orthog.transx = rep(-3.84, 4), orthog.transy = rep(-2, 4),
reflect = "y"
so that the
SPR
-axis attains its maximum on the right-hand side.
