I have two groups (experimental, N=6, and control group, N=20). For each participant I measured a score (let say mean reaction time) 4 times. I would like to check:
- whether these groups differed in the beginning (Time 1)
- whether the score changes in time (for control group)
- compare the change in time for both groups
I use R to analyze the data. What statistical tests can I use, given the small group size? I would be very happy for any advice or link. Thank you in advance.