Fixed effects model
Generalization with input uncertainty

When there is input uncertainty for the y {\displaystyle y} data, δ y {\displaystyle \delta y}, then the χ 2 {\displaystyle \chi ^{2}} value, rather than the sum of squared residuals, should be minimized. This can be directly achieved from substitution rules:
detectable_content:postscript, combination:two_responses