What historic data is needed to obtain these parameter estimates? In the table below, obtain the composition of the active portfolio by completing the un-normalised, and normalised weights columns in the active portfolio. Normalised Share Alpha, a Specific risk, n Un-normalised weights weights AAA 5% 40% BBB 4% 30% CCC -3% 50% What is the implication of the negative alpha and what drawback does this provide n terms of the practical use of this model?

Essentials Of Investments
11th Edition
ISBN:9781260013924
Author:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Publisher:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Chapter1: Investments: Background And Issues
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Practice question on equity portfolio construction using the Treynor-Black method.
Do not use chatgpt so answer properly

The Table below shows the estimates of alpha, a and specific risk, n obtained using
historical data of three shares of a market.
(a) What historic data is needed to obtain these parameter estimates?
(b) In the table below, obtain the composition of the active portfolio by completing the
un-normalised, and normalised weights columns in the active portfolio.
n²
Normalised
Share Alpha, a Specific risk, n
Un-normalised
weights
weights
AAA
5%
40%
BBB
4%
30%
CCC
-3%
50%
(c) What is the implication of the negative alpha and what drawback does this provide
in terms of the practical use of this model?
(d) Briefly state the next two steps required to obtain the final TB portfolio.
Transcribed Image Text:The Table below shows the estimates of alpha, a and specific risk, n obtained using historical data of three shares of a market. (a) What historic data is needed to obtain these parameter estimates? (b) In the table below, obtain the composition of the active portfolio by completing the un-normalised, and normalised weights columns in the active portfolio. n² Normalised Share Alpha, a Specific risk, n Un-normalised weights weights AAA 5% 40% BBB 4% 30% CCC -3% 50% (c) What is the implication of the negative alpha and what drawback does this provide in terms of the practical use of this model? (d) Briefly state the next two steps required to obtain the final TB portfolio.
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