In my research methods course students have collected data so that they can compute one simple correlation (n=180). Both questions are on 5-point scales. I want them to plot the data to see if it looks like there is a correlation. However, a simple scatter plot is uninformative because there is at least one subject who is reporting every combination on the 2 questions (so the scatterplot looks like a grid). Is there some way of plotting the data so that the "dots" are bigger when there are many cases. Or maybe one needs an entirely different plotting strategy. I use SPSS. Help?
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