These
fixed effects
are in addition to the primary time and/or treatment effects, so do not specify any effects confounded with those. The effects can include any mixture of
class variables
(as specified in the
Class Variables
above) or continuous
covariates
.
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If you specify more than one fixed effect that 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 effect, 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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