I have some experimental data which showed significant interaction between the two factors that I investigated and found that each of the main factors are significant (p < 0.05) and the interaction is also significant (p < 0.05).I am using SPSS.
What I want to know is:
1. Which level at each of the factor different significantly with each other?
2. Which level of the factors that interact and gave the best result?
What you need is an interaction plot. This is a graph that answers this question. If you look at the link below you can find discussions and examples of such plots. feel free to contact me with further questions. Best wishes, David
http://www.bing.com/search?pc=COSP&ptag=D071616-A0A14E5293D1943C986F&form=CONBDF&conlogo=CT3330954&q=interaction+plot+factorial+design
PS On p.67 of the book in this link you can find discussion and R code for drawing the plot. Best wishes, David
https://www.amazon.com/Analysis-Experiments-Chapman-Statistical-Science/dp/1439868131/ref=sr_1_1?ie=UTF8&qid=1487410817&sr=8-1&keywords=john+lawson+r
Dear Houssou
This question is already given in different meaning.
Please refer to:
1. Landau, S. and Everitt, B. S.(2004). A Handbook of Statistical analyses using SPSS.
2.Howitt, D. and Cramer, D.(2008). Introduction to SPSS.
Regards,
Zuhair
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