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Multiple linear regression

Model the length of 26 Japanese larches from the nitrogen and phosphorus content of their needles. Add or remove terms and see how the fitted surface and the effect of nitrogen change.

R²
share of variation explained
Adjusted R²
penalised for extra terms
Residual standard error

Fitted surface

dots: the 26 trees

Length against nitrogen

predicted length at four phosphorus levels

Effect of one unit of nitrogen

as a function of phosphorus

Coefficients

TermEstimateStd. errort valuep-value
Show as R output