You #R wizards here, please consider this situation. We have two eyes; so frequently my data is in this form (simplified, of course):
subject01 rightEye condition01 value
subject01 rightEye condition02 value
subject01 rightEye condition03 value
subject01 leftEye condition01 value
subject01 leftEye condition02 value
subject01 leftEye condition03 value
To compare something between the eyes the needs to be arranged like so:
subject01 condition01 valueRightEye valueLeftEye
subject01 condition02 valueRightEye valueLeftEye
subject01 condition03 valueRightEye valueLeftEye
There must be a clever way with melt and cast from "reshape2" rather than my current clumsy loops for this. Suggestions warmly welcomed!
Thanks in advance, best, Michael.