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Beta and R-Squared

 

Mutual Fund Beta and R-Squared

For a given change in the market, what returns can you expect from a fund? Beta and R-squared answers this question



How often have you tuned into a business channel or opened the pages of a pink paper to be told where the markets are headed? The word currently going around is that markets should move up by approximately 25 per cent in the next year. This seems so reassuring. Wouldn't it be equally reassuring if one could get an indication of how a fund would perform in the future? Especially when all performance data is just an indication of how a fund has performed in the past. And more so when this 'past performance' is accompanied by the warning that it may or may not be replicated in the future.


There are statistical tools, which can give you an idea of how a fund will move in relation to the market. Beta is a statistical measure that shows how sensitive a fund is to market moves. If the Sensex moves by 25 per cent, a fund's beta number will tell you whether the fund's returns will be more than this or less.


The beta value for an index itself is taken as one. Equity funds can have beta values, which can be above one, less than one or equal to one. By multiplying the beta value of a fund with the expected percentage movement of an index, the expected movement in the fund can be determined. Thus if a fund has a beta of 1.2 and the market is expected to move up by ten per cent, the fund should move by 12 per cent (obtained as 1.2 multiplied by 10). Similarly if the market loses ten per cent, the fund should lose 12 per cent (obtained as 1.2 multiplied by minus 10)


This shows that a fund with a beta of more than one will rise more than the market and also fall more than market. Clearly, if you'd like to beat the market on the upside, it is best to invest in a high-beta fund. But you must keep in mind that such a fund will also fall more than the market on the way down. So, over an entire cycle, returns may not be much higher than the market.


Similarly, a low-beta fund will rise less than the market on the way up and lose less on the way down. When safety of investment is important, a fund with a beta of less than one is a better option. Such a fund may not gain much more than the market on the upside, it will protect returns better when market falls.


So beta seems to be just what the doctor ordered. But as in the case of all things which seem to be too good to be true, there is a catch. The problem is that beta depends on the index used to calculate it. It can happen that the index bears no correlation with the movements in the fund. Thus if beta is calculated for large cap fund against a mid-cap index, the resulting value will have no meaning. This is because the fund will not move in tandem with the index.


Due to this reason, it is essential to take a look at a statistical value called R-squared along with beta. The R-squared value shows how reliable the beta number is. It varies between zero and one. An R-squared value of one indicates perfect correlation with the index. Thus, an index fund investing in the Sensex should have an R-squared value of one when compared to the Sensex. For equity diversified funds, an R-squared value greater than 0.8 is generally accepted to mean that the underlying beta value is reliable and can be used for the fund.


Beta and R-squared should thus be used together when examining a fund's risk profile. They are as inseparable as risk and return



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