Gebruiker:Pjetter/klad: verschil tussen versies
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Regel 322:
and fill that in the previous equation and you get:
:<math>V \left( \widehat{\beta} \right) = V \left( \frac{\sum_i^{n} x_i ( \beta x_i + \varepsilon_i )}{\sum_i^{n} x_i^2} \right)</math>
Two typical properties of variance when X and Y are independent are the following:
:<math> {Var} \left( A + B \right) = Var (A) + Var (B) </math>
and
:<math> {Var} \left( aX + b \right) = a^2 Var {X}</math>
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