Hi everyone,
I am trying to create one graph which shows pre-/post-test scores for three separate measures, all for related cases. I do not want to categorise them in any way, though. Is this possible using SPSS?
Thank you
Leo
1. You could find the gain scores (post - pre) and plot these, but this means losing information and makes strong assumptions about the scores (e.g., that 102-100 is the same as 3-1).
2. Why do you want bar charts? Scatterplots might be more useful in this situation. e.g., see Figure 2 of https://www.degruyter.com/view/journals/edu/2/1/article-p45.xml for a pre-post scatterplot by groups.
1. You could find the gain scores (post - pre) and plot these, but this means losing information and makes strong assumptions about the scores (e.g., that 102-100 is the same as 3-1).
2. Why do you want bar charts? Scatterplots might be more useful in this situation. e.g., see Figure 2 of https://www.degruyter.com/view/journals/edu/2/1/article-p45.xml for a pre-post scatterplot by groups.
Hi Daniel
Thanks for your response. This is intended for a lay audience so I wanted to keep the change in scores visually easy to digest, e.g. a clustered bar chart where pre/post test scores appeared close to each other for each measure. Problem is I only have space for one graph (will go in a poster). Not sure if this is doable though as I haven't been able to find anything online!
Hello Leo,
I agree with Daniel's suggestions, but, if you have to have a bar chart, then just organize your data in "long" format, rather than "wide" format, and include a new variable to represent the specific score type (variable & occasion combo).
For example (ID, score_type, score):
1, 1, 21.2
2, 1, 18.7
3, 1, 16.4
1, 2, 24.9
2, 2, 25.1
3, 2, 20.6
1, 3, 11.2
2, 3, 13.5
3, 3, 14.7
...
Then prepare a bar-chart where the score_type is the x-axis, and score is the y-axis (this defaults to mean value, unless you specify other function).
Score_type 1 might be variable A pre,
Score_type 2 might be variable A post,
Score_type 3 might be variable B pre,
and so on.
Good luck with your work.
Leo Libbs, I'm not really answering you question because you confined your "package" to SPSS, but in my limited experience with Excel, it is capable to producing some quite nice output - possibly of the kind you want.
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