I have always encounter difficulties in interpreting ANOVA test. But this video is an excellent piece Which makes it easier for me to explain the results
Excellent point...the null hypothesis always refers to the population values. Let me see if I can fix that without having to re-upload the whole video.
Hello Prof. Can i do one way Anova with individual Likert items (Measured on 5 point scale), which are part of a formative construct in my study? I am confused whether i can go with ANOVA, as Likert items are ordinal in nature. Request you to please clarify and provide an appropriate reference.. Regards, Karan.
if samples are NOT independent its not necessary that repeated measures ANOVA is the solution right? Repeated measures is for when all measurements are repeated. What is the solution of some are repeated and some are not. for example data for eyes, kidneys or knees. It is not necessary that all patients have data from both organs and also not necessary that both will lies in the same group. Please let me know if this independence assumption is violated and it NOT a repeated measures scenario.
If the scores from the groups are independent, use a one way ANOVA. If they are repeated/paired/correlated, use a repeated measures ANOVA. If there are both (male v. female + before v. after scores), you use a Mixed ANOVA, which begins with the repeated measures menu and uses the categorical variable as a "between factors" score. Hope that clarifies
@@ResearchByDesign as I mentioned, the protocol that I depict cannot qualify as repeated measures because it is possible that both eyes of the same person can be in the same group. Hence, repeated mesaures ANOVA would be violated.
at 4:10 you mention your vedio about "central limit theorem", however i cant find it on your channel. can you please provide a link for it? on a side note, you are great!
That was a video that never made it to production, but recently I have restarted it. I don't know when it will be released, but I am guessing some time this summer to be ready for fall classes.
Hi Sarah...I do have that resource but I can't send it through the comments. Reach out to me through Missouri State U and I will send you the notes from my class. Cheers
Big question, ANOVA test the normality of data, but I have seen people test the normality of error(residuals). I am confused which is the right way, please help!
Typically, we use ANOVA for testing differences between sample means, but the F-test gets used for a variety of other tests. In regression, we test the normality of the residuals using a Q-Q plot or histogram (but that is an assumptions check, not a hypothesis test, proper). If you are doing an ANOVA and want to check the normality of the data, you can do that with a K-S test or a histogram. Hope that is helpful.
The ANOVA summary table summarizes each of the elements of the ANOVA because there is so much complexity to the analysis. It helps you keep track of all the moving parts.
