tracking error calculation

[singlesong80]

Anyone know this? I am loosing it. This should be basic right?
Risk free rate of return is 5%
SD of bench mark is 15%
beta of bench mark is 1
rate of return for portfolio is 19.8%
SD 11.9%
Residual SD 11.5%
Beta 0.8
What is the tracking error?

 

[1morelevel]

Shouldnt it be the sd of residual? Its the standard deviation of R(port) - R(Bench) so that is the residual right?

 

[sparty419]

Tracking error = SQRT[(Bp - Bm)*(SDm)^2+(SDrp)^2]
SDrp = S.D. of residual portfolio.
This Q. is from the 2003 AM if I am not mistaken. I haven’t seen this formula this year as well as during the last year. So I would assume we don’t need to know.
If you have seen it, pls. do let me know.