Here are some discussion related to bias and variance related to model performance, feel free to ask if any doubt
[Avoidable variance and Bias]( Human level of performance for structured data - #11 by Deepti_Prasad )
[Bias problem]( High Bias Problem - #12 by Deepti_Prasad )
[Feature relativeness to bias and variance problem]( Bias & Variance in relation to Degree of polynomial & Lambda - #2 by Deepti_Prasad )
Regards
Deepti