What is wrong with this graph?

September 28, 2010
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(This article was first published on Social data blog, and kindly contributed to R-bloggers)


This is a graph from our surveys with the University of Munich in B&H about ten years ago.(Click on it to see a large version.) In previous presentations (but not in peer-reviewed journals) I have talked about the peak on the subscale of Paranoid Ideation for the B&H samples.
But looking at it again I see that this is partly an illusion and it is due to the fact that I broke the rule of never implying a continuous scale (the x-axis) where there isn't one. Paranoid ideation only looks so high because it *happens* to be squeezed in between two unrelated scales which happen to have lower scores.

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