Two-way repeated-measures ANOVA in SPSS

How to conduct a two-way repeated-measures (related) ANOVA in SPSS (PASW). View in HD (720p) and in full screen for best resolution.

[sabrinawilson]

I just wanted to say thank you so much. I was struggling with the university tutorials when it came to moving the variables across. They never said to make sure it was in the right order inline with the levels. You made it so simple! Thank you again.

[johnnys]

got so lost doing a mixed ANOVA for my thesis. this has helped me massively! cheers

[eroxxdthree]

Awesome Video. Very straightforward and easy to follow. The only thing that's missing is checking for normality and sphericity, and which appropriate model to follow thereafter. Thanks for posting!

[alliealltheway]

Thanks so much for helping me with my dissertation you're a star

[tumadrelanieves]

Thank you, Jim. I thought it was a bit confusing that the columns were not labelled right at the beginning. However, it just required a bit of patience on my side. As some other colleagues are asking: which post-hoc tests would be more appropriate, and with which type of multiple comparisons correction?

[franci]

Hi Jim,
I seem to be having a problem understanding a few things. Correct any phase I get it wrong- firstly before starting we would have to suggest a null hypothesis. So my case study is- There will be no significant difference between a diet with exercise and just a diet. So my two independent variables are diet and exercise. After I would have to check whether it is parametric or not by using the Kolmogorov-Smirnov (K-S) Shapiro-Wilks. Once we have the score <or > than 0.05 we can tell if it is parametric. Then we have to identify whether they are related or unrelated. Now here is the tricky bit where I get stuck... The data I have has info like Body Mass Index with follow up test, for example, baseline value, then week 6 & week 12 and a follow up, weight (the same procedure as BMI), age, step count (exercise) and what type of program they are in. I am not sure whether I put all this information on Spss and what goes on the within-subject-variables or the between subject factors. On top of that I have to check the interaction between the two factors... I could send you the data so you could tell me what I'm doing wrong. Would you like me to send you the data?
Regards

[duckyman]

Thanks Jim, very helpful working on my thesis

[JimGrange.]

Hi - thanks for your comment. Sounds like you need a 4 (mice) x 3 (time) mixed ANOVA. If the interaction is significant, it suggests that the mice are behaving differently to other mice across your repeated measure (time). You could follow this up with separate one-way repeated measures ANOVAs, one for each mouse.

[themezingable]

For my analysis I’m trying to click on compare main effects but when I click on options button it doesn’t lead me to a new window

[JimGrange.]

I got your message, but have been very busy with teaching. It is a 3 x 2 x 2 design, as you say in (a). However, if you are just using a difference score (that is, leg strength after 30 minutes minus leg strength at beginning), then it would just be a 3 (group) x 2 (time) design.

[romisarohani]

Hi Jim, thanks for the video.
I have a question related to test. What if for the time constrain, half of my participants goes through HighSwitch and Low Repeat conditions and another half go through HighRepeat and LowSwitch condition, which means instead of all participants going through all 4 conditions, they go through only 2 condition but still experience each level of each factor. In this type of experimental design, can I still run 2-way repeated measure ANOVA?
I look forward for your answer.
Thanks,
Romisa

[ちんたけし-hn]

Thank you for your great contribution！Thank you so much again。

[feyojazz]

Thanks for the video, it was very clear .

[zoltanczigany]

In similar cases the investigators when they publish they results they give a p value and say that "Significant difference between groups with 2way repeated measures ANOVA: p<0.00001" for instance....I dont know which p value should I use....(regarding the different time points i know that I have to implement post hoc tests to assess differences....but now I m really interested in this "overall" p value as i mentioned) Thank you very much for your help! Best regards, Zoltán

[JimGrange.]

@viridianstar Thanks! Effect sizes—and which to use—are quite a sticky issue in Psychology, so I didn't want to commit anyone to any particular one. I use partial eta squared, which can be obtained by selecting "estimates of effect sizes" in the "options" menu after you have defined your independent variables.

[misssade]

What assumptions would you test before analysing interpreting results?

[demeclocyclinesiadh]

thanks for the video. Can i use 2 way anova with repeated measures if the sample size of the independent variable are different ?

[JimGrange.]

Yes, it sounds like a 2-way ANOVA (a 3 x 7). I am not sure what you mean by which p-value you need to look for. You will have one p-value associated with your main effect of group, one for the main effect of time, and one for the interaction. All might be relevant for your purposes.

[JimGrange.]

No, that is a mixed design as handedness is a between-subjects factor. Your "time" factor is repeated measures (i.e. all participants are tested in the morning *and* afternoon). What you describe is a 2x2 mixed design.

[missbexychick]

Hi there, your vids are excellent. Just wondering if you could help me with which type of ANOVA to use.
I have four different mood conditions (sad, happy etc.). I am measuring individuals moods at time 1 and am measuring their moods at time 2 after the mood inductions (to see if the mood inductions have worked). The mood measures are questionnaires with four questions on their mood. Is this a two way repeated measures ANOVA or one way repeated measures ANOVA? How would I do this on SPSS?