Suppose I wish to assess reaction time of individuals before and after treatment, using R code.
Now to analyse the results if I had additional treatments, I could use repeated measurements ANOVA in R, using the aov() function. These approaches however assume that there is only one measurement of reaction time per person, per treatment.
However suppose that for each individual, we measure their reaction time 5 times before treatment and 5 times after treatment. How should I adjust the t-test or repeated measurements ANOVA to account for this?
I know I could simply average prior to analysis, but is it also possible to include all the 5 trials in the analysis in R and if so how ?
Note the data might look something like this:
Subject Treatment Time Result
Subj1 Coke Morning 15
Subj1 Coke Morning 14
Subj1 Water Morning 17
Subj1 Water Morning 20
Subj2 Coke Morning 45
Subj2 Coke Morning 46
Subj2 Water Morning 58
Subj2 Water Morning 75