XIRR ... not Dietz

Ya know, people STILL use that Dietz method to calculate their returns.

>But it's January and they're interested in ...
That's not the point. The point is that Dietz can be quite inaccurate and, in fact, sometimes can NOT even generate a number!

>Huh?
Once upon a time we gave an example in a Dietz tutorial, but we'll repeat it now:

>In what tutorial?
Can't remember, but you can search here

Anyway, here's the example:
 Time Amount Invested 4 years ago \$10,000 3 years ago -\$10,000 2 years ago -\$10,000 1 year ago \$10,000 Now \$1,000

>Negative investments mean a withdrawal, eh?
Yes. You start with \$10K four years ago, then a couple of \$10K withdrawals (a year apart) then a \$10K investment (a year ago) and you have, today, \$1K.

Anyway, if you stick this data into one of those Dietz calculators, it'll generate an annual return of 0/0.

>That's not a number ... is it?
No, and Dietz calculators get pretty upset!

>Where can I find one?

Check here.
Start with \$10K in 1/1/2000, withdraw \$10K in 1/1/2001 and 1/1/2002, add \$10K in 1/1/2003 and today, 1/1/2004, your portfolio is worth \$1K.
See what the calculator says

>So is there an answer? I mean, other than 0/0 and ...?
Yes. An XIRR calculator says it's (about) 19%.

>Where can I find one?
Can't remember, but you can search here