spyros
2013-Jan-29 11:52 UTC
[R] checking the significance of the effects of altitude on endemic species richness
Hi all, I run a glm analysis of the effects of altitude to the proportion of endemic plant species of Crete and the results are: Call: glm(formula = pCRENDSR ~ Alt, family = binomial, data = dat) Deviance Residuals: Min 1Q Median 3Q Max -0.078121 -0.022688 0.005328 0.027674 0.056688 Coefficients: Estimate Std. Error z value Pr(>|z|) (Intercept) -3.2005908 1.5129560 -2.115 0.0344 * Alt 0.0012146 0.0008905 1.364 0.1726 --- Signif. codes: 0 ?***? 0.001 ?**? 0.01 ?*? 0.05 ?.? 0.1 ? ? 1 (Dispersion parameter for binomial family taken to be 1) Null deviance: 2.217584 on 23 degrees of freedom Residual deviance: 0.029835 on 22 degrees of freedom AIC: 14.469 Although there is an increase to the proportion of the endemic species with altitude, the results of the glm do not show a significant effect. However, in absolute values, the number of endemic species is significantly increased with altitude. I would like to ask if I have to do something else for the statistical significance except from the p=0.1726. Thank you in advance, Spyros -- View this message in context: http://r.789695.n4.nabble.com/checking-the-significance-of-the-effects-of-altitude-on-endemic-species-richness-tp4656939.html Sent from the R help mailing list archive at Nabble.com.