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Dear R users, I would like to get some simple syntaxes for ROC curves for the research of thresholds and cluster analysis for preliminary regrouping of variables for a simple scoring system. Thanks. Tin Tin

Hi thanks for your comment. Thought the same, but was worth trying if there is an alternative! -- View this message in context: http://r-sig-ecology.471788.n2.nabble.com/Diversity-on-standardised-densities-in-R-tp7578474p7578480.html Sent from...

Hello Peter, will try it your way in R and see what results I ll get. Thanks -- View this message in context: http://r-sig-ecology.471788.n2.nabble.com/Diversity-on-standardised-densities-in-R-tp7578474p7578482.html Sent from...

Hello everybody, I am trying to fit a logistic regression model by using glm() function in R. My response variable is a sample proportion NOT binary numbers(0,1). Regarding glm() function, I receive this error: non integer # successes in...

Hello I am going to estimate the parameters of generalized Poisson model of Consul. ?I need to use the function: ?generalized -poisson-likelihood(y). can anybody make me sure what the vector y is? ?? If the amounts of variable is...

---------------------------------------- ?Hello ?I am going to estimate the parameters of generalized Poisson model of Consul. I need to use the function: generalized -poisson-likelihood(y). ?can anybody make me sure what the vector y is? ?If the amounts of variable is...

Dear Sir/Madam I am trying to get the Maximum Likelihood Estimation of a parameter in a probability mass function. The problem is my pmf which includes a summation and one integral. it is not similar to other known pdfs...

Hello Mario, the only reason I was trying to do this unorthodox method, is because I know that the abundances I have will give more or less biased diversity calculations and I was trying to get around that. However, it...

Hello r users, I have to deal with int8 data with R. AFAIK R does only handle int4 with `as.integer` function [1]. I wonder: 1. what is the better approach to handle int8 ? `as.character` ? `as.numeric` ? 2. is...

By the way, I think I could use (if Zoop tha name of the dataset) rrarefy(Zoop, sample=50). However, in this case it will not allow me since there are samples with zero individuals. Even if I delete those...

Hello, If the vector of observed frequencies is: ?f<-c(0,0,0,2,3,6,17,15,21,21,14,10,5,1,5) and the vector of probability?:p11<-c(7.577864e-06, 1.999541e-04? ,1.833510e...

Hello, I am just a beginner of R 1.9.0. I try to construct a predictive score for the development of liver cancer in cirrhotic patients. So dependant variable is binanry (cancer yes or no). Independant variables are biological...

Hello ,I am trying to write a loop for sum of integrals . the integral is:integrand4<-function(x,a=1.5,n=3,k=0){(((a+1)*x)^k)*((2-x)^n)*(exp(-a*x-2))/(factorial(k)*factorial(n...

I had similar problems, actually it is very difficult to customize persp graphics, you should try wireframe in lattice instead. This reference might help to customize the wireframe plots: http://www.polisci.ohio-state.edu/faculty/lkeele/3dinR.pdf JR...

HelloI am trying to estimate the parameter of a function by the Maximum Likelihood Estimation method.If the function is the difference between two integrals: C<-function(n){integrand3<-function(x) {((2-x)^n)*(exp(ax-2))}cc<- integrate (integrand3...