Hi.. I was just trying to familiarize myself with the quantmod package, and
I didn't find any explanation for the following after searching:

> getSymbols("VTI",src="google")
[1] "VTI"
> yearlyReturn(VTI)
           yearly.returns
2007-12-31     0.02833664
2008-12-31    -0.38357674
2009-12-31     0.25994636
2010-12-03     0.12364733
> getSymbols("VTI",src="yahoo")
[1] "VTI"
> yearlyReturn(VTI)
           yearly.returns
2007-12-31     0.02833865
2008-12-31    -0.69176714
2009-12-31     0.25994636
2010-12-03     0.12364733


Any idea why 2008 is so different?  I saw in the documentation that there
were issues with Google data for 2003-- but I couldn't find a mention of an
issue with 2008 there or in searches.

Also, the Google Finance web page (http://www.google.com/finance?q=vti)
shows the 2008 return to be -40.31%.. Closer to the Google data's return, to
be sure, but still off.

Is there something going on there that didn't make the docs (or at least my
search of them)?

many thanks,
-Dave

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