Iíll just start by giving a brief description of my study. Itís a memory study in which participants study an object and a cue stimulus together for each study trial. Whilst they study the stimuli I collect eye-tracking data to find out the number of fixations made towards the object and the total time spent looking at the object. In the test phase participants are presented with the cue and tested to see if they can recall the object that went with it. Each participant studies and is tested on 40 trials.
For each trial I therefore have these variables:
1. Number of fixations to object
2. Total time on object
3. Was the object later recalled yes or no?
I now want to know whether or not either number of fixations or time on target are correlated with subsequent recall. Whilst it seems simple enough to carry out this correlation within each participantís data, I donít know how to combine these correlations together into an across participants calculation.
Iím under the impression that, given the fact that there are both within- and between-participant sources of variance, I canít simply put all of the data into one huge table and pretend that all the trials are from the same subject. One major problem I have in finding the correct way to perform this analysis is that I donít even know a name to give to this problem. Iím sure I canít be the only person to have had this problem but having asked around our department and searched through various forums Iím drawing a blank.
If you could help me out or point me in the right direction Iíd really appreciate it.