search for: population1

...NULL) (137.187.154.154) I am running simulations using fisher's test on 2 x c tables and a very small p.value from fisher's test (<2.2e-16) is returned as a negative number. Code follows. > set.seed(0) > nreps.outer <-7 > pvalue.fisher <- rep(NA,nreps.outer) > > population1 <- c( rep("A",300),seq(1:100)) > > population2 <- c( rep("A",100),seq(101:200)) > > > for (j in 1:nreps.outer){ + n1 <- sample(30:100,1) + n2 <- sample(30:100,1) + + group1 <- sample(population1, n1, replace=T) + group2 <- sample(population2...

...My issue here is, that all possibilities to do so seem to normalize the eigenvectors to length 1. Although the helpfile of eigen() states, that using eigen(, symmetric = FALSE, EISPACK =TRUE) skips normalization this is (I guess) not applicable for me as my matrices are symmetric. x<-eigen(cov(population1))$vectors[,1] y<-eigen(cov(population2))$vectors[,1] angle (in degree): ((acos((x%*%y)/(sqrt(x%*%y)*sqrt(y%*%y))))*180)/pi Thus by using normalized vectors, the divisor becomes meaningless being 1. Does anybody have an idea to get raw eigenvectors? Thanks a lot Kay Lucek Aquatic Ecology &...

...NULL Integrated Fitted Log-likelihood -2915.527 -2641.427 -2634.182 Chisq df p AIC BIC Integrated loglik 548.20 7.00 0 534.20 505.04 Penalized loglik 562.69 6.96 0 548.78 519.80 Model: Surv(day, status) ~ condition * infestation + (1 | infestation/population1) Fixed coefficients coef exp(coef) se(coef) z p conditionstarved 3.3960657 29.8464431 0.3228277 10.52 0.0000 conditionwater 3.3277968 27.8768547 0.3224368 10.32 0.0000 infestationinf...

...dant tree populations have the same size-class distribution or not. The trees have been placed into size-class categories based on their basal diameters. Once I started running the stats on my data, I got confused with the results. Just to show an example of what I was testing I ran stats comparing population1 to population 2. and then comparing population 3 to population 2. Popn1 Popn2 Popn3 880 769 0 34 40 19 10 24 19 2 2 8 2 2 36 0 0 0 Common sense tells me that P1 and P2 are similar and that P3 and P2 are dissimilar. However, for the P1 versus P2 test I am getting p-value of 1 (saying they ar...