I have the following experimental data. The dependent variable is a reaction time which has been measured on n = 30 test subjects. The reaction time was measured six times per test subject and the duration between the measurements varied from 1 minute to 6 minutes. I would like to understand the influence of two independent variables; namely IV1 = the order when the reaction time was measured (1,2,3,4,5,6) and IV2 = the time duration between the reaction times were measured (1 min, 5 min, 6 min, 1 min, 5 min, 6 min)? The data has not been balanced in any way. Thus, the final data set consists of 6 reaction times per test subject (the first and fourth after 1 min duration, the second and fifth after 5 min duration and the third and sixth after 6 min duration).


  1. Does this experimental design have a name such as "factorial design", "block design", "fractorial factorial design" etc.?
  2. What are appropriate ways to investigate the influence of IV1 (repetition) and IV2 (duration) on the DV (reaction time)?
  3. Would it be OK to group data based on e.g. duration and then compare e.g. group 1 (repetition 1+4 & duration 1 min) with group 3 (repetition 3+6 & duration 6 min) to assess the influence of duration? Since such grouping would include reaction times from the same test subject, would it be appropriate to take the average response time for the two repetitions or would it be better to include two values/test subject?

Thanks in advance!


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