Information Technology Reference
In-Depth Information
Figure 10.20
The
Fixed Effect Model
screen.
In the navigation panel at the left of the screen, select
Fixed Effect
Model.
In the
Class and quantitative
window, select
Time_Recode
and
then select the
Main
pushbutton;
Time_Recode
will automatically appear
in the
Effects
window as shown in Figure 10.20.
In the navigation panel at the left of the screen, select
Fixed Effect
Model Options.
Select
Type 3
under
Hypothesis test type
,
Residual
maximum likelihood
under
Estimationmethod
(this is the default), and
Betweenandwithinsubject portions
under
Degreesof freedommethod
.
This is illustrated in Figure 10.21.
Selecting the
RandomEffects
tab in the navigation tab brings you to the
blank initial screen shown in Figure 10.22. Click the
Add
pushbutton and
two displays will be presented. First, the expression
>
will appear in the
Random effects to estimate
panel. Second, several
panels in the
Random effects and options
panel will become available.
This is shown in Figure 10.23.
Our goal in this window is to specify our
subid
variable as a random
effect and to register that this is the way we have identified our subjects
in the data file. A
random effect
is associated with an independent variable
whose levels are not systematically manipulated by the researchers or
which are the results of the sampling plan. We typically wish to generalize
beyond the specific levels present in the research to a wider population of
<
no effects selected
