[R-SIG-Finance] making sense of 100's of funds
tmuhlhof at indiana.edu
Thu Aug 16 04:15:42 CEST 2007
Sorry for the delay in my reply.
Yes you are looking for funds that produce intercepts that are as
strongly positive as possible when their fund returns are regressed on
the returns to the benchmark. Remember to consider standard errors!
Since we are looking at a risk-adjusted return measure, only a fund
which has a *statistically significantly* positive intercept has a
positive intercept. Sorry if this is obvious to you, but many people
For choice of benchmark, the ASX SP200 strikes me as a very good
In terms of calculating returns, CalculateReturns (which I have never
used, but just looked at the manual) does not seem to take into account
distributions, which is imprecise. The total one-period return at time t is:
r_t = [Price_(t) + Dividends_(t) + CapGainsDist_(t) - Price_(t-1)] /
Here Price_(t) is the price at time t, Dividends_(t) and
CapGainsDist_(t) are respectively the dividends and capital gains
distributions made by the fund between t-1 and t. The distributions may
be substantial, so they will make a difference. If you use "adjusted
closing" prices from Yahoo Finance, you are OK, as these are adjusted
for exactly that (and splits).
paul sorenson wrote:
> Thanks for the tips. I am somewhat of a cynic also. When it is my own
> retirement fund, academic meets real-life in a fairly personal way! I
> have heard figures that something like 98% (from memory) of Australian's
> "don't understand superannuation".
> I am trying to get myself well into the 2%. Writing R code leveraging
> some of the great packages out there is just a method of learning which
> I find works for me. It can be slow going at times though.
> I have picked out 8 funds to crunch through and using the ASX SP200 as
> the benchmark for exercising my code. My "practice" data set is at
> http://www.metrak.com/tmp/exitprices.csv and I retrieved the SP200 using
> get.hist.quote("^AXJO", start="2002-01-01", quote="Close", retclass="zoo").
> I have used CalculateReturns from PerformanceAnalytics to create returns
> as zoo objects so hopefully I will be able to calculate the alphas. If
> I understand your comment below, I am looking for a more positive
> intercept on my choice of fund compared with the benchmark?
> Tobias Muhlhofer wrote:
>> Unless you are looking at index funds, you need to see whether your
>> funds produce alpha. To do this, pick a set of benchmarks according to
>> your fund's style and investment strategy, like Morningstar category
>> index or something like that (or perhaps just the general stock market
>> plus the two Fama-French factors), regress the fund's returns on the
>> benchmark returns, and see whether you have a significantly positive
>> intercept after fees. This is the best way of measuring systematic-risk
>> adjusted returns.
>> Being a finance academic (and therefore a cynic), and judging from my
>> own research, if benchmarked correctly, very few fund managers generate
>> positively significant alphas, and so I personally buy index funds for
>> whatever style I want to invest in, and there I choose the one with the
>> lowest expense ratio.
>> R-SIG-Finance at stat.math.ethz.ch mailing list
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