Information Technology Reference
In-Depth Information
Here is the order in
which we named our
variables
These coordinates are
in the order that the
variables were named.
For example, (2,1)
refers to the second
level of Vehicle and
the first level of
Drinks. You must click
the variables over in
the order that they
appear in this list,
that is, the first
variable clicked over
will be placed in the
cell coordinate (1,1)
so you need to be
careful here.
Figure 11.7
The main
GLMRepeatedMeasures
window reached just after clicking the
Define
pushbutton.
SPSS has registered both
vehicle
with two levels and
drinks
with three
levels. Click
Define
to reach the main
GLMRepeated Measures
window.
The main dialog window for
GLM Repeated Measures
is shown in
Figure 11.7. Note the number pairs in parentheses next to the lines with
question marks. These are in the order that we named the variables; this
order
(vehicle, drinks)
isshownattheverytopofthewindowundertothe
expression
Within-Subjects Variables
. The first value in each parentheses
refers to the level of the first independent variable,
vehicle
in this case;
the second value in each parentheses refers to the level of the second
independent variable,
drinks
in this case. SPSS requires that you define
your variables before it will allow you to perform the analysis (notice that
the
OK
pushbutton is not yet available).
Now we can deal with defining the variables. To define the within-
subjects independent variables, we need to supply the variable (the named
column in the data file) corresponding to the specified values of the levels
of each. For example, the cell combination or coordinate (1,1) indicates
thefirstlevelof
vehicle
(car) and the first level of
drinks
(0); the coordinate
(1,2) indicates the first level of
vehicle
(car) and the second level of
drinks
(1); and the coordinate (1,3) indicates the first level of
vehicle
(car) and
the third level of
drinks
(1). The last three are analogous using the second
level of
vehicle
(SUV).
