These
fixed effects
are in addition to the primary time 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 Additional Class Variables above, if available) or continuous
covariates
.
|
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.
|
|
|
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.
|
|
|
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
.
|