Dear list members,
I am trying to change the reference level of a factor but when I run a
model with the lm function the new order it does not taking place (I
still have the old order of the levels).
> relevel(nidprop$treatment, ref="c", data=nidprop)
[1] a a a a b b b b c c c c
Levels: c a b
> modelo1 = lm(hight ~ treatment, data = nidprop)
> summary(modelo1)
Call:
lm(formula = hight ~ treatment, data = nidprop)
Residuals:
Min 1Q Median 3Q Max
-1.6052 -1.0626 -0.0950 0.9228 3.0768
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 37.9140 0.7368 51.461 1.98e-12 ***
treatment[T.b] -0.2298 1.0419 -0.221 0.8304
treatment[T.c] -3.1133 1.0419 -2.988 0.0153 *
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Residual standard error: 1.474 on 9 degrees of freedom
Multiple R-squared: 0.552, Adjusted R-squared: 0.4525
F-statistic: 5.545 on 2 and 9 DF, p-value: 0.02696
Any idea why?
Best,
Manuel Spínola
--
Manuel Spínola, Ph.D.
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspin...@una.ac.cr
mspinol...@gmail.com
Teléfono: (506) 2277-3598
Fax: (506) 2237-7036
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