In the old excel you could install an add in that would allow constructing Pearson correlation matrices on large blocks of data. Don't see it in excel 2010 - why am I not surprised? Anyone know if it's still an option and where it is hidden? I HAVE to be able to do these matrices or excel if of little use to me. The correlation function they have where you compare two data series is useless to me. I need to do correlations between 34 elements on 500+ samples. It's easy in excel 2003.