search for: boon_tot

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2009 Jul 14
1
Interaction term in multiple regression
...ot contain the interaction term then the output is identical. However the results of the partial F tests differ dramatically when the interaction term is included. Here are the results from R of the test with the interaction: > summary(lm(TD[Year==2007]~Kd[Year==2007]*area[Year==2007], data=boon_tot)) Call: lm(formula = TD[Year == 2007] ~ Kd[Year == 2007] * area[Year == 2007], data = boon_tot) Residuals: Min 1Q Median 3Q Max -0.42696 -0.25648 -0.11960 0.03151 1.27957 Coefficients: Estimate Std. Error t value Pr(>|t|) (...