# Company Specific Risk

We are given the following and asked how much of RBC stock’s excess return variation can be attributed to company specific risk.

Regression Statistics

Multiple R = 0.7131

R-squared = 0.5086

Standard error of estimate = 0.0269

Observations= 60

This is the solution:

The R^{2} in this regression is 0.5086. This result suggests that about 51 percent of the total variation in the excess return to RBC stock (the return to RBC above the risk-free rate) can be explained by excess return to the market portfolio. The remaining 49 percent of RBC stock’s excess return variation is the nonsystematic component, which can be attributed to company-specific risk.

Why not use the Standard Error of Estimate to find the SSE which is related to the errors of the regression?

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Because it takes a lot more work to arrive at the same answer.

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Simplify the complicated side; don't complify the simplicated side.

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so technically my way of thinking is not wrong?

I tried using the formula of SEE to find SEE and I get 4.27% which is not the same answer as the one above.

my calculation- 0.0269 = squared root of SEE over 59 and 4.27%

Your way of thinking is OK, but I don’t understand your calculation.

How many independent variables are there? You need to know that to follow your approach.

Simplify the complicated side; don't complify the simplicated side.

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There is 1 one independent variable. So what I did is used the below formula:

SEE=(SSE/n-2)

^{0.5}Are you sure that there’s only one independent variable (i.e., did they state that explicitly)?

Where did you get 59?

Using your formula, what’s the value of SSE?

What’s the total sum of squares (TSS)?

Simplify the complicated side; don't complify the simplicated side.

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Actually, it shouldn’t be 59; it should be 58 because they told us we have two parameters hence, its 60-2=58

Using the formula, I get SSE= 0.04196938

TSS wasnt given to us

So, how do you use SSE to get the idiosyncratic risk?

Simplify the complicated side; don't complify the simplicated side.

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Quick question. Isn’t SSE the diosyncratic risk because our goal is to minimize it as much as possible ?

Second, thats what I got for SSE=0.04196938 which is different from 49% given in the solution and I dont get where I messed up

It is idiosyncratic risk. However, the reason isn’t that our goal is to minimize it.

Which is correct.

Evidently the question was intended to mean “What percentage of the total variance is idiosyncratic?” That isn’t clear from what you wrote. You calculated the SSE, but not the percentage of TSS that SSE represents.

Where did you get this question?

Simplify the complicated side; don't complify the simplicated side.

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in the curriculum in regards to quants. Reading 4, example 4 on page 254

What’s the exact question it asks?

Simplify the complicated side; don't complify the simplicated side.

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Regression Statistics

Multiple R = 0.7131

R-squared = 0.5086

Standard error of estimate = 0.0269

Observations= 60

Alpha: 0.0031( intercept ); 0.0070 ( standard error); 0.4429 9 ( t stat)

Beta 0.9068 (coefficient); 0.1170 ( standard error) ; 7.7504 ( t stat)

Question: How much of RBC stock’s excess return variation can be attributed to

company-specific risk?

The question is not well worded: it would be reasonable to interpret it either as how much absolute variation, or as what percentage of the total variation. On the real exam I would expect there to be no such ambiguity.

Nevertheless, when they give you three answer choices that are all percentages, you can be sure that they meant the latter interpretation, not the former.

Simplify the complicated side; don't complify the simplicated side.

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