search for: flev1

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2007 Aug 07
2
Interaction factor and numeric variable versus separate regressions
...h interaction summary(lm(y~x:f, data=d)) Call: lm(formula = y ~ x:f, data = d) Residuals: Min 1Q Median 3Q Max -2.8109 -0.8302 0.2542 0.6737 3.5383 Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 3.68799 0.41045 8.985 1.91e-12 *** x:flev1 0.20885 0.04145 5.039 5.21e-06 *** x:flev2 1.49670 0.04145 36.109 < 2e-16 *** x:flev3 6.70815 0.04145 161.838 < 2e-16 *** --- Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 Residual standard error: 1.53 on...