Contrasts with Two Way ANOVA in SPSS Tutorial (SPSS Tutorial Video #21) - GLM, COMPARE

In this video, I cover the details of how how to conduct and interpret the results of post-hoc comparisons or contrasts within a Two Way ANOVA in SPSS. I first conduct a 2x3 ANOVA, show you how to use the GLM (general linear model) tool to then add specific pair-wise contrasts, and give you a chance to try it yourself
I STRONGLY SUGGEST WATCHING MY TWO-WAY ANOVA VIDEO BEFORE WATCHING THIS ONE IF YOU ARE UNFAMILIAR WITH ANOVA. VIDEO HERE: • Two Way Anova in SPSS ...
Video about One-way ANOVA: • One Way ANOVA (Analysi...
Video about One-way ANCOVA: • One Way ANCOVA (Analys...
Video about Planned Contrasts with One Way ANOVA: • Planned Contrasts and ...
Video about Two-way ANOVA: • Two Way Anova in SPSS ...
Video about Planned Contrasts with Two Way ANOVA: • Contrasts with Two Way...
Video about Multivariate Analysis of Variance (MANOVA): • Multivariate Analysis ...
Video about Repeated Measures ANOVA: • Repeated Measures ANOV...
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[@sunlightsun7976]

Thank you very much! I have succeed in solving my problems of planned comparison by your video!

[@dellagarner3731]

Thank you...super helpful! How do you calculate partial eta squared for each contrast?

[@user-db1nu9dy7r]

thanks for your instruction. can i add Scheffé post hoc comparison in spss.

[@vukasinviskovic9121]

Great video, thanks! I hope you'll have many new viewers and subscribers. Just subscribed my self :)

[@DataDemystified]

Thanks!

[@TheNimioSounds]

Thank you for this very helpful video!
I have some related questions:
Can you also look at simple effects for a three-way interaction in a 2x2x2 between-subjects factorial?
Isn’t it a case of p-hacking if you look at simple effects for a non-significant interaction effect? For instance, what if the three-way interaction is not significant, but when looking at simple effects for one the factors in the interaction there is a significant effect.
Thanks!

[@desichase79]

Hello, how do I report these GLM Contrast results in a paper? Could you please provide an example? Thank you!

[@aidengregg]

Dear Jeff,
Many thanks for your clear video.
I have some harder questions! How do you do the following in SPSS?
You have a 2 x 2 factorial (between-group) ANOVA. IV1 (Hi vs Lo); IV2 (Hi vs Lo).
Instead of just looking at simple effects (e.g., IV1: Hi vs Lo @ IV2: Hi), suppose you want to...
i) Compare 3 vs 1 (Hi/Hi vs Hi/Lo, Lo/Hi, Lo/Lo)
ii) Compare means on opposite diagonals: (Hi/Hi vs Lo/Lo; Hi/Lo vs Lo/Hi)
Is there any alternative to taking the MS error for the ANOVA, and comparing the means "by hand" using it?
I am having no luck finding it online.
Thanks!

[@DataDemystified]

That's a great question. The easiest way to do this is to actually recode your two IVs into a new single IV with 4 levels. So you'd have:
IV: Hi-Hi, Hi-Lo, Lo-Hi, Lo-Lo
Then you can run a planned contrast on that single IV. For comparing 3 vs 1, you'd use the /lmatrix command for GLM (rather than ANOVA) and the syntax would be -3 1 1 1 (where the -3 goes to whichever level you're trying to compare against the average of the other three). For diagonals, you would do "1 0 - 1 0" where the 1 and -1 are for the means you want to compare.
Hope that helps!

[@agilabenedict8924]

If my interaction is not significant should I go for post hoc in two way ANOVA.

[@user-gz9cf1pb9l]

I cannot use GLM in my syntax because I do not have the SPSS Advanced Statistics package. Sad day.

[@aunahmed5549]

I was expecting to see planned contrasts (lmatrix) for a two-way ANOVA.