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If you specify more than one 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 effects (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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An
at-sign
(
@
) can be used to limit the number of interactions. For example, typing
A|B|C@2
removes the three-way interaction term.
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