Hi, thanks to all for this super-handy forum. I've learned a lot and finally had a reason to post.

I have investments that give me a monthly return, say like a mutual fund. I want to get a yearly number based on this performance.

So for example
Jan. 0.43%
Feb. -0.83%
Mar. 1.76%
Apr. 1.44%
YTD 2.81%

I know it's not a straight sum... so... what is it?