A colleague from Iceland very kindly drew my attention to 'Rapidminer' data analysis software. A very usable free version can be downloaded, and there is mention of a full access free version for researchers. Even if you decide to purchase a license it doesn't seem expensive. If you have large quantities of data Rapidminer is said to be an efficient tool to run cross-correlation checks on a lot of parameters (loading, trigger, current, voltage, electrolyte,, pressure, gas purity, cathode, anode, substrate, catalyst composition etc) and maybe save you some time and head-scratching.. I have yet to try it myself btw, but if it is only half as good as they say, it could be incredibly useful.