I have run an ANOVA and my results have revealed no significant difference between groups. However the estimated marginal means has revealed a significant difference between 2 of my subgroups although this isn't revealed in the standard post-hoc analysis. Can anyone tell me what this means as I am none the wiser after Google.
I'm a frequent user of SPSS but it's been a long time since I've done an ANOVA so not sure if I can be any help but would you not normally run post hoc tests only if your ANOVA result indicated a significant difference? I don't know about marginal means but I'd think if you can't reject the null hypothesis from either the ANOVA or post hoc tests you don't have a significant result to speak of. What's your research on, out of interest?