photoguy
Thinks s/he gets paid by the post
- Joined
- Jun 15, 2010
- Messages
- 2,301
Comparing a Vanguard fund to a DFA fund with a similar name is a common way to compare them, but it is not the right way to compare them, since they actually hold different stocks. One should compare portfolios with the same asset allocation and not the same fund names.
For example, for two portfolios of different funds, in order to call them equivalent one would want
(a) the Morningstar 9-box style grid to have similar numbers in each of the 9-boxes so they have the same breakdown of large-cap, mid-cap, small-cap, value, blend, and growth stocks.
(b) the same percentages of US stocks, developed international stocks, emerging markets stocks, REITs, bonds, etc.
(c) the same average market cap for US, foreign, and emerging separately and together,
I think the issues you raise is yet another factor that makes the comparison not so clear cut. Slice & dice is based on the Fama French model where size, value are primary determinants of stock returns. However, vanguard funds are often criticized for not providing as much exposure to these factors -- this is why the DFA version of US small-cap value may hold different stocks (smaller and with lower P/B) and also provides at least a partial explanations of the +2%/year returns.
To compensate for the lower size/value loadings you may be able to tweak your portfolio instead. E.g., if I were to use DFA funds, I will set my small-cap value to 20% but with vanguard I will need to go up to 30% to maintain the same exposure. (Note percentages made up). This makes the comparison in a whole portfolio context (which is what really matters) non-trivial as you would need to balance across all of the slices.
According to IFA's site, DFA based S&D portfolios have outperformed ones where the slices are based on vanguard funds where simple substitution is used. Obviously this is not an unbiased source, but that result doesn't surprise me given that DFA funds have stronger loadings. What I would really be interested in knowing is (1) would a DFA based S&D portfolio outperformed a vanguard one when you let the allocations slide to make up for the lower value/size exposure in vanguard funds and (2) how much do I have to change my allocations to compensate.
Finally, another problem with vanguard funds for the do-it-yourselfer is that the funds are often mixed from a style perspective. E.g., vanguard's small-cap value fund has a big chunk of REITS whereas (to my knowledge) DFA has done a much better job of not mixing asset classes in their funds.