search for: sexunknown

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2011 Mar 31
2
ANCOVA for linear regressions without intercept
...o summary(lm(body length ~ sex*head length)) this will include the intercepts as below Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) -6.49697 1.68497 -3.856 0.000118 *** sexMale -9.39340 1.97760 -4.750 2.14e-06 *** sexUnknown -1.33791 2.35453 -0.568 0.569927 head_length 7.12307 0.05503 129.443 < 2e-16 *** sexMale:head_length 0.31631 0.06246 5.064 4.37e-07 *** sexUnknown:head_length 0.19937 0.07022 2.839 0.004556 ** --- Is there any way I can remove the intercepts...