In a series of recent articles I reviewed how style analysis can be used to replicate investment strategies and indexes using only historical returns (see here, here, and here). That’s a powerful application, but it only scratches the surface for productive uses of style analysis. What else can you do? Monitoring asset weights via a broad set of asset allocation funds is one possibility.

Tracking the implied weights through time for dozens or hundreds of asset allocation ETFs and mutual funds offers an intriguing window into how the crowd’s preferences wax and wane for various asset classes. In turn, this information may be valuable for developing insight about market trends and how your strategy compares with decisions in financial industry overall .

As a simple example, let’s run the numbers on three popular asset allocation funds: Vanguard STAR (VGSTX), PIMCO All Asset (PASCX), and iShares Core Growth Allocation (AOR). In practice, focusing on dozens if not hundreds of funds offers the potential for a more robust set of results, but for purposes of illustration this toy example will suffice.

Once you have a set of funds to analyze, the next key issue is choosing a set of return benchmarks for the style analysis. There are numerous possibilities, depending on your analytical focus. As one example, let’s use a set of ETFs as proxies for the major asset classes.

If you have a particular interest in a single fund, style analysis offers a tool for estimating how the asset allocation has evolved through time. The chart below tracks VGSTX’s shifting weights for the major asset classes, based on a rolling 30-day window. One insight that emerges: VGSTX’s exposure to the high-yield-bond risk factor surged in late-2017, but in recent weeks this allocation has dropped sharply (pink line, which tracks JNK). The analytics also indicate that exposure to the broad US equity market has trended up to a relatively high level in recent months at roughly the 50% mark (VTI via the black line).