The same question has come up twice in the past week, so I thought it worth posting.
A manager manages several different accounts for the same client. Some returns are money-weighted (MWRR), some time (TWRR). The manager wishes to consolidate the accounts to present a single picture. How should they do this?
First, from what perspective are the returns being presented? That is, are you telling the client how THEY did, or how YOU, the manager did?
If the former, then I'd report everything as MWRR. In fact, I think that it might be reasonable to aggregate all the information and derive a single MWRR, although it might be better to asset weight the money-weighted returns; I'd want to spend more time on this before committing to one way or the other.
If the latter, then I think I'd asset weight the individual returns to derive the overall return. This means, asset weighting both the MWRR and the TWRR.
Can we mix MWRR and TWRR? Why not? In this context, each represents how the manager did. Asset weighting tells us overall how the manager did.
Can we calculate MWRR for short time periods? Yes, as short as you would like.
I'll try to work up some examples.
Have some thoughts on this? Please offer your comments.