Gebruiker:Pjetter/klad: verschil tussen versies
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Regel 310:
Take the variance of beta-hat:
:<math>V \left( \widehat{\beta} \right) = V \left( \frac{\sum_i^{n} x_i Y_i}{\sum_i^{n} x_i^2} \right)</math>
Fill in the estimator of a):
:<math>V \left( \widehat{\beta} \right) = V \left( \frac{\sum_i^{n} x_i Y_i}{\sum_i^{n} x_i^2} \right)</math>
Now use the equation for Y<sub>i</sub>:
: <math> y_i = \beta x_i + \varepsilon_i </math>
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>
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