Use the text field to specify additional
variables
or effects by which to model the
covariance
structure of the response variable.
These effects typically comprise
class variables
and their interactions.
Caution
: Do not repeat any effects here that are already specified as
Fixed Effects
.
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Type one or more
random effects
in the text field.
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If you specify more than one fixed effect then you must separate the effects with
spaces
. For example, assuming
A
and
B
are listed as
Class Variables
, typing
A B
in the text field specifies variables
A
and
B
as main
fixed effects
.
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To specify interactions between effects, type an
asterisk
(
*
) between the effects. For example, assuming
A
and
B
are listed as
Class Variables
, typing
A B A*B
specifies variables
A
and
B
, and the interaction between
A
and
B
as fixed effects and constructs a two-way
ANOVA
model.
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A
vertical bar
(
|
) can be used to create
main effects
and interactions. For example, typing
A|B
is the same as typing
A B A*B
.
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