Information Technology Reference
In-Depth Information
Similarly, adding a new column
x
:
p
×
1 requires
Uz
=
U
x
−
q
X1
1
(6.14)
with predictivity
q
X1
)
UJU
(
x
−
1
1
q
X1
)
(
x
−
)
.
(6.15)
1
)
(
1
(
x
−
q
X1
I
−
P
)(
x
−
q
X1
6.6 Functions for constructing biadditive biplots
Our main function for constructing biadditive biplots is the function
biadbipl
.In
Section 6.6.1 we give a detailed description of
biadbipl
. The reader is encouraged
to study and experiment with the arguments of
biadbipl
. As with our other main func-
tions like
PCAbipl
and
CVAbipl
introduced in previous chapters, several functions are
called by
biadbipl
for drawing the biplot, adding features to it and changing its appear-
ance, that are generally not directly called by the user. In addition to these functions,
the functions
biad.ss
and
biad.predictivities
may be called in order to obtain
additional information about the biplots constructed with
biadbipl
. These two functions
are briefly introduced in Sections 6.6.2 and 6.6.3.
6.6.1 Function
biadbipl
This is a function for constructing biadditive biplots associated with a two-way table.
Provision is made for approximating the two-way table itself, the overall mean-corrected
two-way table as well as the two-way table of interactions. The function
biadbipl
allows for one-, two- or three-dimensional biadditive biplots. Several enhancements to
the basic biadditive biplots are available.
Usage
biadbipl
uses the same calling conventions as
PCAbipl
and shares the following
arguments with it:
alpha.3d
dim.biplot
markers.size
predictivity.print
aspect.3d
exp.factor
n.int
reflect
ax
e.vects
offset
rotate.degrees
ax.col.3d
factor.x
offset.m
select.origin
ax.name.col
factor.y
ort.lty
side.label
ax.name.size
font.3d
parplotmar
size.ax.3d
cex.3d
ID.labs
pos
size.points.3d
col.plane.3d
ID.3d
pos.m
Title
col.text.3d
line.length
predictions.3d
Titles.3d
constant
markers
predictions.sample
