I have two strains of animals and three different treatments on each strain (2 strains X 3 treatment). One of the strain (strain 1) was used as control, and the experiment was to test whether treatments improve anything on the diseased strain (strain 2). The results turned out no effect of treatments (treatment 1 and treatment 2) on control strain (strain 1) by one way ANOVA. Now my focus is on the diseased strain (strain 2).
Can I only include four groups to perform one way ANOVA? The four groups are: control strain + control treatment; diseased strain + control treatment; diseased strain + treatment 1; diseased strain + treatment 2 (it is actually pause of treatment 1)?
Do I need to include everything (2 strains X 3 treatment) to perform two way ANOVA?
Thank you very much.
Dear Tao Yang,
With ANOVA Test, there are two main types, one-way and two-way. Two-way tests can be with or without replication. ANOVA has one channel between groups, it used when you want to test two groups to see if there is a difference between them. Two-port ANOVA without replication, it used when you have a group and you are testing the same group again.
For more details and information about this subject, I suggest you to see links and attached file on topic.
Analysis Of Variance (ANOVA) - Statistics Solutions
https://www.statisticssolutions.com/anova-analysis-of-va...
One-way ANOVA in SPSS Statistics - Step-by-step procedure ...
https://statistics.laerd.com/.../one-way-anova-using-spss-...
Two-way ANOVA in SPSS Statistics - Step-by-step procedure ...
https://statistics.laerd.com/.../two-way-anova-using-spss-...
Best regards
Thanks for your input!
Jochen Wilhelm
, Mohamed-Mourad LafifiI tested it (2X3) in two way ANOVA and the interaction/treatment/strain factors are significantly different.
If I would like to see whether three treatments have different impacts on the diseased strain (not the other control strain), can I compare this by presenting the diseased strain and use one way ANOVA followed by multiple comparison? OR I will have to always include both strains using two way ANOVA followed by multiple comparison?
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