by **bottlebrushpress** » Tue Mar 23, 2021 11:07 pm

Would you have any idea why I'm getting a message error saying 'factor consists of only one level'?

I'm trying to run a mixed ANOVA with a repeated measure on the second factor. I'm looking to examine whether opinions about schizophrenia change (and are stable over time pre-summary, post-summary, 3 weeks and 6 weeks), after participants have been presented with either a categorical definition of schizophrenia, or one that describes the condition as a continuum/spectrum. I selected a mixed ANOVA thinking it would be a 2 (message is either categorical or continuum) x 4 (time) with a repeated measure on the second factor. Within-subjects is time, between subjects is message. Does that sound about right?

The problem I'm having is that when I'm trying to split the data into 2 groups for simple effects/post hoc, it comes up with an error saying that my factor contains 'one level only', which I presume is the message factor. This factor should be continuum/symptoms (2 levels).

My concern is that maybe I'm running the wrong analysis? It wouldn't be a one-way analysis because there are two groups linked to the first factor, is that right?