Tag: Data types
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Should we retire nominal, ordinal, interval, & ratio levels of measurement?
One of the first things all psychology students are taught is levels of measurement. Every student must wrap their heads around the four different forms data can take: nominal, ordinal, interval, or ratio. These are the bedrock of a lot of students’ understanding of measurement, including mine. I didn’t realise there were questions about their…
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Should you analyse ordinal data like interval or ratio data?
A couple of months ago, I wrote a summary of a recent paper arguing you shouldn’t analyse ordinal data like interval or ratio. If you do so, there’s a risk of inflated Type I and Type II error rates, as well as reduced power [zotpressInText item=”{VD8XETGZ}”][note]Open access version here[/note]. In response, Helen Wauck wrote a…
PsychBrief 