Friday, July 17, 2015

My inner nerd is impressed: A mean plot for categorical data.

I love x-y scatterplots. They allow me to visualise the relationship between two variables. But they had a drawback. When you're trying to understand how two seven-point scales interact, they are silly looking.

An x-y plot with two seven point scales is essentially something like 49 dots. Sure each dot has a different weight but visually not very helpful.

First pickup today, then. Stephen Prendergast suggested what we call a "mean plot" which summarises it perfectly.

I could do it from scratch but I like the way Stephen says he can send me some SPSS syntax for it.
Oh, and then I just learnt the benefits of saving factor scores on a factor analysis as opposed to creating a new variable from the mean of the relevant items.

Yes, the data nerd in me is having a lot of fun.

1 comment:

  1. I will be calling you when I get to my research subject ;)

    ReplyDelete