search for: treelin

Dear all I am learning R I am doing Z-test with package 'BSDA' here is my syntax and result: > sdgr.ztest<-z.test(growth[type=='SD'& from_treeline=='above'], + growth[type=='SD'& from_treeline=='below'],alternative = "two.sided", + mu = 0, sigma.x =(sd(growth[type=='SD'& from_treeline=='above'],na.rm = T)), + sigma.y =(sd(growth[type=='SD'& from_treeline=='below&...

Hi all, This is as much as statistical/estimation question as an R-specific one, but here goes. I am trying to use logistic regression to predict suitability of habitats for certain plant species. The response variable is a binary one that indicates whether a particular species is found at a site on the landscape. The independent variables represent physical characteristics of the landscape