用贝塔（无杠杆）计算贝塔（有杠杆）时, if the capital structure has debt and equity instead of equity only....you can use the following formula
B(L)=B(U)*((1+(1-T)(D/E))

B(L)=Beta for leveraged company(company that have issue debt and equity)
B(U)=Beta for unleveraged company(compnay that have issue equity only...)(You can also use a comparable company for reference of the unleveraged company)

楼主，你好像我同学的妹妹。她现在在纽约。

2# chingngai

这里面隐含债务的贝塔是0，如果不为0呢

4# pickuprighthere
其實leveraged company 已經是指債務Beta 不等於0
所以有equity + debt 的 leveraged company 的 Beta 才會大於只有equity 沒有債務(debt)的unleveraged company,當然, 要這兩間公司(leveraged company and unleveraged company)的基本財務和公司狀況要大致一樣才可以算....

βB=(rB-rF)/(rM-rF)