How to estimate error variance in an l 18 Consider Phadke pg 89 How would the two unassigned columns contribute to error variance? Remember li8(21X37 Hasl+1*(2-1)+7*(3-1)=16DOF But i8 rows Therefore 2 dof can be used to estimate the sum square due to error Robust System Design 16881 mit 人 Session #11How to Estimate Error variance in an L18 • Consider Phadke pg. 89 • How would the two unassigned columns contribute to error variance? • Remember L18(21x37) – Has 1+1*(2-1)+7*(3-1) = 16 DOF – But 18 rows – Therefore 2 DOF can be used to estimate the sum square due to error Robust System Design 16.881 Session #11 MIT