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What is the difference between regression beta and bottom up beta?

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Question added by Milind Dalvi , Chief Executive Officer , Association of Investment Bankers of India
Date Posted: 2016/06/06
Abdullah  Aldrees
by Abdullah Aldrees , CFA Institute Research Challenge | www.cfainstitute.org | Pittsburg, KS

The regression beta uses the historical stock price for the company. Usually 5-year monthly data, and you run a regression to obtain beta. On the other hand, bottom-up beta uses publicly comparable firms then you obtain  median or average leveraged beta. Also, estimate the average market value (D/E ratio). After that leverage it. use the following formula: 

 

Beta unleveraged = Beta levered/ (1+(1-tax rate)*(D/E of comparable))

Beta firm = Beta unleveraged*(1+(1-tax rate)*(d/e of firm))

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