A Practitioner's Guide to Factor Models by Edwin Burmeister; Richard Roll; Stephen A. Ross; Edwin J.

By Edwin Burmeister; Richard Roll; Stephen A. Ross; Edwin J. Elton; Martin J. Gruber; Richard Grinold and Ronald N. Kahn

This monograph offers the paintings of 3 teams of specialists addressing using single-factor versions to give an explanation for safety returns: Edwin Burmeister, Richard Roll, and Stephen Ross clarify the fundamentals of Arbitrage Pricing thought and speak about the macroeconomic forces which are the underlying resources of possibility; Edwin J. Elton and Martin J. Gruber current multi-index types and supply information on their reliability and usability; and Richard C. Grinold and Ronald N. Kahn tackle multiple-factor versions for portfolio danger.

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Also evident from Table 6 is that return is strongly related to size. The difference between the average return on the small and large firms is more than 1 percent a month. Furthermore, the relationship is almost monotonic. These results mean that the smaller firms provide a higher return as well as lower beta. If beta is a risk measure, this evidence strongly favors the purchase of small stocks. Alternatively, perhaps beta is not a sufficient metric for risk. The relationship between return and size is at least partially captured by the four-factor model.

9 Comparing the explanatory power of the first factor in the four-factor model with the explanatory power when all four factors are included shows that the added three factors explain a significant proportion of the variability of returns. The sensitivity of portfolio returns to the NRI 400 index (beta) also declines That the four-factor model has a higher explanatory power than a single-factor market model in the fit period is to be expected. S. studies, nor is the deterioration with size. with size, which was not at all expected, because beta is usually considered a measure of risk.

Conversely, if a manager has special knowledge that the economy is going to slide into a recession, he or she will want to lower the portfolio's exposure to business cycle risk. Multimanager Fund Performance. Most sponsors employ more than one manager. Even though each may perform well when compared with a particular style benchmark, that is not the issue of most importance to a sponsor. A sponsor wants to evaluate the risks and performance of the overall fund. The sponsor should combine the portfolios of individual managers into one overall fund portfolio and then use the APT to examine the risk exposure profile and performance of the fund portfolio.

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