Now that your data are entered and
saved, it is time to analyze. Click “Analyze,” then “General Linear Model”
and then “Repeated Measures.”
This box will appear.
You want to type something into the
“Within-Subject Factor Name” box. The word “Factor” refers to your IV. Some
people choose to type in a word that relates to the IV in this box.
Sometimes, SPSS has the word “Factor1” in the box to start and people use
that. I usually type in the word “level” instead. This makes things easier
for me. The name you choose is up to you. You want to type a number into the
“Number of Levels” box. Because my IV has 3 levels (conditions), I will type
in the number 3. If my IV had 4 levels (conditions), I would type in the
number 4 instead.
When you are finished filling in the
blanks, click the Add button.
The name and number that you entered
previously will appear in a large window. In this example, you can see the
word “level(3)” in the window. This tells SPSS that there is one IV that I
want to analyze, named level, and it has 3 levels (conditions). Click the
Define button to continue.
This will appear. There will be two
windows of importance. One large window on the left contains your three
conditions. In this example, you can see the three conditions, named
caffeine, juice and beer, in the window on the left. There is a second large
window on the upper right. You can see blanks with the numbers 1, 2 and 3
next to them. Your goal will be to get each of the three condition names
from the box on the left to the box on the upper right.
Click on the condition name to
highlight it and then click on the arrow button that is closest to the box
on the upper right.
Each time you transfer a condition
name, you will see this name disappear from the window on the left and
appear in the window on the upper right. In this example, see how the
condition name “caffeine” disappeared from the window on the left and now
appears in the window on the right, next to the number 1. This tells SPSS
that caffeine is condition 1.
Keep transferring all of your
condition names over, using the same strategy as before. Just highlight the
variable name and move it with the corresponding arrow key. When you are
finished transferring, you should see something like the picture below. See
how all three condition names appear in the window on the upper right? When
you see something like this, click the Options button below.
This box will appear. You will see
many options in the Display area. Click the blank box next to the
Descriptive Statistics option. You will see a check mark appear to indicate
that this option has been selected. Note that you could deselect by clicking
on the blank box again. When you are finished, click the Continue button.
You will return to this box. Click
the OK button and wait a few seconds for processing.
SPSS will print out a lot of
numbers. You will probably have to scroll down to see all of your results.
To a meaningful place and with a
meaningful name. In this example, I decided to call this file “Effect of
Beverage Type on Number of Hours of Sleep Output.spo.” This will help me
easily find this output file if I want to look at it in the future.
Enter Data |
Analyze Data |
Interpret Data |