Testing the Assumptions for Two-Way ANOVA Using SPSS

This video describes how to test the assumptions for two-way ANOVA using SPSS.

[ashleymogle]

A two-way ANOVA is an extension of the one-way ANOVA, but now there are two independent variables, therefore, it can be a bit more challenging to sift through the data and make sense of your findings. This video was helpful in not only refreshing me on what exactly a two-way ANOVA is, but it also showed me how to use SPSS in an easy to follow manner.

[vanessakent]

This was a lifesaver in completing the assignment in Chapter 4. It did go at a fast clip so I had to pause it at each step to make sure I understood it. Some of the variables were already preset on your screen.

[amandavalentino]

Dr. Grande- Thank you for the informative video about the two-way ANOVA using SPSS. As i am familiar with SPSS, this helped me understand and remember what is needed.

[ivybyun]

I see how each week's videos build on our previous knowledge, and examining the assumptions is clearer now. I appreciate your discussion on the practical applications of how to treat outliers.

[marisamaguire]

I really appreciate Dr. Grande’s explanation and demonstration on how to properly test the assumptions for two-way ANOVA when using SPSS. As someone who is unfamiliar with SPSS and has little knowledge of the concepts, I find the demonstrations to be helpful as they give a clear and concise walkthrough of the information. Similar to Chelsea, I also found the discussion of the three assumptions when using two-way ANOVA to be beneficial in understanding the concepts further.

[Adrianao]

Great tool, very useful to have a better understanding of how to test assumptions for 2-way ANOVA using SPSS. Thank you Dr. Grande.

[dr.deborahbannan]

I found this helpful, but had to break it down into several segments for practical use. I appreciated how you went back and explained the steps.

[chelseareeve]

I like that you included discussion of what each of the assumptions are with using a two-way ANOVA to make this concept easier to understand. In addition, since the data did not fit into the basic assumptions, I like that you talked about where one could go with the data after the fact.

[jacklinskibicki]

Although I am not familiar with many of these terms or concepts, I felt this video helped to explain the process of testing assumptions in SPSS. I also found it helpful that the video explained how address the violations found within each assumption, such as the presence of outliers and lack of homogeneity of variance that could be discussed in the limitations section when presenting research.

[EppahIbrahim]

Thanks for this video very easy to understand the concepts of testing ANOVA assumptions,

[chelseaswift]

This was really helpful! I'm writing my masters dissertation and I violated the Levenes and I've been stuck for days but I feel like I understand the solution now, thank you!

[brittanyhoffman]

Thank you for sharing this video Dr. Grande. There seems to be a lot of information displayed when plugging in all the data and it is a bit confusing. I appreciate the box and whiskers graph in clearly displaying the outliers within the data.

[grishmaprabhukhot]

Hi Dr. Grande, I have a question related to the test of homogeneity. If I do not have homogeneity of variances, how do I proceed? I came across this website 'laerd' and they have mentioned:
If your data does not have homogeneous variances, you have four options:

1. Transform your data.
2. Carry on regardless.
3. Perform robust analysis.
4. Weighted least squares regression.

I referred to the 'carry on regardless' which says:
"If group sample sizes are equal or approximately equal and large, there is normality and the ratio of the largest group variance to the smallest group variance is less than 3, run the two-way ANOVA anyway because it is somewhat robust to heterogeneity of variance in these circumstances (Jaccard, 1998)."

So my question is: If the group sample size of my data is equal and if my data is normally distributed, then can I carry on regardless?

Your help is highly appreciated. Thank you so much!

[sotiriagilou]

Thank you for your so clear explanations!!!Greetings from Greece

[mandabear]

I thought this video did a great job of explaining the assumptions of a Two-Way ANOVA. I had forgotten about all the assumptions so I was thankful for the reminder. I also loved how he explained what to do if a assumption was violated. Good video!

[simonehenry]

Dr. Grande did a good job describing the assumptions.

[aussiebreezekorb]

This was helpful AFTER watching the newer video you made on "Introduction of a 2-way ANOVA" I can see what you are talking about put to work in the SPSS spreadsheet.Thanks

[richaudsley]

This was very helpful for me to complete my homework assignment in Chapter 4 of Mertler & Vannatta. Thank you Dr. Grande!

[ariadnaaguero-roman]

This video was helpful in understanding ANOVA. I like that it's divided by levels and you can compare the data between the two groups. I like the feedback on what to do with the outliers, either have a good reason to eliminate from data or note it in the limitation section.

[angieku]

It is helpful to know when we should use split file versus analyze groups collectively. Thanks for explaining how to test the assumptions thoroughly.