similar to: Zicounts package

Dear UseRs: I have simulated data from a zero-inflated Poisson model, and would like to use a package like zicounts to test my code of fitting the model. My question is: can I use zicounts directly with the following simulated data? Create a sample of n=1000 observations from a ZIP model with no intercept and a single covariate x_{i} which is N(0,1). The logit part is logit(p_{i})=x_{i}*beta

I'm trying to fit a zero-inflated poisson model using zeroinfl() from the pscl library. It works fine for most models I try, but when I include either of 2 covariates, I get an error. When I include "PopulationDensity", I get this error: Error in solve.default (as.matrix(fit$hessian)) : system is computationally singular: reciprocal condition number = 1.91306e-34 When I

I have data on number of vines per tree for ~550 trees. Over half of the trees did not have any vines and the data is fairly skewed (median = 0, mean = 1.158, 3rd qu. = 1.000). I am attempting to investigate whether plot location (four sites), species (I'm using only the four most common species), or tree dbh has a significant influence on the number of vines per tree. When I

Hello Folks, Very new to R so bear with me, running 5.2 on XP. Trying to do a zero-inflated negative binomial regression on placental scar data as dependent. Lactation, location, number of tick larvae present and mass of mouse are independents. Dataframe and attributes below: Location Lac Scars Lar Mass Lacfac 1 Tullychurry 0 0 15 13.87 0 2 Somerset 0 0 0

Hi, I have two questions. First, I'd like to compare a ZINB model to a negativ binomial model with the Vuong test, but I can't find how to performe it from the zicount package. Does a programm exist to do it ? Second, I'd like to know in which cases we have to use a double hurdle model instead of a zero inflated model. Many thanks, St??phanie Payet REES France R??seau

On my Windows XP and 200 boxes the shares that I have mapped in a login script have their descriptions set to the following: downloads on 'Samba Sever 2.2.6pre2' (M:) This would be fine if I had set server string = Samba Server %v in the smb.conf file. However I have this set to server string = Samba. When I browse the network on the Windows boxes the correct description appears for

Hello, I'm a bit new to the world of R so forgive my ignorance. I'm trying to do a zero-inflated negative binomial regression and have received an error message and i'm not sure what it means. I'm running R 2.5.1 on XP. I have just tried a really simple version of the model to see if it would run before I put all the variables in. I have attached all the variables to the

I am interested in utilizing this so called "double hurdle" model in my study. We can write the model in the following way: if (z'a + u > 0 & x'b + e > 0) y = x'b + e, else y = 0 In the model, consumption y is the (left-) censored dependent variable. e and u are the normally distributed error terms. z'a is the participation equation and x'b is the

Here is a summary of responses to my original email (see my query at the bottom). Thank you to Achim Zeileis , Anders Nielsen, Pierre Kleiber and Dave Fournier who all helped out with advice. I hope that their responses will help some of you too. ***************************************** Check out glm.nb() from package MASS fits negative binomial GLMs.

Hey folks, I'm trying to do all subsets on a zero-inflated poisson regression. I'm aware of the leaps and regsubsets functions but I don't know if they work for ZIP regressions or how the syntax fits in for them. Can anyone help? The model syntax is: > zip.zc <- zicounts(resp=Scars~.,x=~Location + Lar + Mass + Lac + Lar:Mass + Location:Mass, data = alan2,

Greetings R Users! I have a data set of count responses for which I have made repeated observations on the experimental units (stream reaches) over two air photo dates, hence the mixed effect. I have been using Dr. Jim Lindsey's GLMM function found in his "repeated" measures package with the "poisson" family. My problem though is that I don't think the poisson

We have some new Solaris boxes (both Sparc and amd64), and as they are not yet in production use I borrowed some time on them to run tests over CRAN packages, using the Solaris make and Sun Studio compilers. The results were quite depressing. Sun Studio 12 compilers are also available for Linux, and there the problems are worse (for C++ code). Line endings ============ We checked in R CMD

Hi All Please see the Rprofile file which i have modified as follows and after that when I start R then I see that R says to me "TRUE" for all the packages implying that all loaded at once. But when i try to use commands as simple as help("lm"), it doesnt work nor any of the menu "Packages" is not working. Although the regression using lm ( Y ~ X ) is working

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Hi, I am trying to install via yum group install, open office. I am having a dependancy problem. I get: /nTransaction Check Error: package libIDL-0.8.4-1.centos4 (which is newer than libIDL-0.8.4-1) is already installed yum list gives: Installed Packages libIDL.x86_64 0.8.4-1.centos4 installed Available Packages libIDL.i386

Release Announcements --------------------- These are a security releases in order to address the following defects: o CVE-2019-3870 (World writable files in Samba AD DC private/ dir) o CVE-2019-3880 (Save registry file outside share as unprivileged user) ======= Details ======= o CVE-2019-3870: During the provision of a new Active Directory DC, some files in the private/ directory

Release Announcements --------------------- These are a security releases in order to address the following defects: o CVE-2019-3870 (World writable files in Samba AD DC private/ dir) o CVE-2019-3880 (Save registry file outside share as unprivileged user) ======= Details ======= o CVE-2019-3870: During the provision of a new Active Directory DC, some files in the private/ directory

I am building a Centos machine for a specific piece of third party software. Can I assume that the IA64 verson of CENTOS 4.5 will run on this CPU? Are there any differences in basic libraries between 4.0 and 4.5? Art Edwards

Hello, I?d like to install subversion system in our server (CentOS-4.4) up2date has the subversion-1.1.4-2, but subversion is already on verson 1.4.2 Perhaps I loose good features if I install subversion-1.1.x, but I prefer to use the version delivered by up2date, of course. 1) What do you suggest? If I try to install subversion-1.4.2 from source it asks for apr and apr-util version 0.9.7 or