Hi everyone,
I have data available for 4 years. To Compare weight-loss outcomes between the four medication groups for whole years, I will apply one-way ANOVA.
but I will be asked to compare weight-loss outcomes between the four medication groups for each year of the study. My question is,
should I apply one-way ANOVA 4 times as I have four years?
Thanks
Yes, if you want to compare weight-loss outcomes between the four medication groups for each year, you would perform a one-way ANOVA separately for each of the four years. This will allow you to assess the groups' differences within each year.
However, if you are interested in examining the changes over the four years and the differences between the groups, you might consider a two-way ANOVA (also known as a factorial ANOVA), with “year” and “medication group” as the two factors. This would give you information about the effect of each medication over time and any interaction effects between the medication and the year.
Remember to check the ANOVA assumptions for each analysis, such as normality and homogeneity of variances, to ensure the validity of your results. If the assumptions are not met, you may need to consider alternative statistical methods. If you’re conducting multiple ANOVAs, it’s also important to adjust for multiple comparisons to control the risk of Type I errors. Consulting with a statistician can help determine the best approach for your dataset and research questions.
To compare weight-loss outcomes between the four medication groups for the entire duration of the study (four years), you can use a one-way ANOVA. Here's how you can do it:
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