Hi guys, what is the formula (not XIRR since it doesn't allow all cash flows to be positive - at least one has to be negative to allow xirr to work)
to calculate the rate of return for a stream of uneven cash flows, both on a IRR basis and annual average rate of return:

thanks for your help:

3/1/2003 600
5/25/2003 600
12/1/2003 1000
5/5/2004 1500
6/7/2004 600
10/5/2004 600