I am wondering the number '-2' as you can see in the equation below.
I don't know how does this number come from...
2026-04-01 21:58:22.1775080702
Differentiation (least squares estimators)
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$\beta_0$ appears with a minus sign before it. You're using the chain rule.
See this example: $ \frac{\partial(-x)}{\partial x} = -1 $