similar to: Non-linear regression with latent variable

Hi I have estimated a hazard function using a kernel based method. Now i have to generate a random variate that follows this hazard function. Does any one know method I should use to generate the variate. Thanks Samiul -- View this message in context: http://www.nabble.com/Generate-random-variate-from-a-non-parametric-hazard-function-tp26034880p26034880.html Sent from the R help mailing list

Hi, (1.) How is it possible to get automatic a "lower triangle of correlation matrix" ? h.cor <- cor(dat,use="pairwise.complete.obs") zz <- lower.tri(h.cor,diag=T) ### that's not what i wish and "wrong" ? results <- matrix(unlist(h.cor[upper.tri(h.cor,diag=T)])) results <- matrix(unlist(h.cor[upper.tri(h.cor,diag=T)]),5) Must i take the lowest

Hello, I'm interested in correcting for and measuring unobserved heterogeneity ("missing variables") using R. In particular, I'm searching for a simple way to measure the amount of unobserved heterogeneity remaining in a series of increasingly complex models (adding additional variables to each new model) on the same data. I have a static database of 400,000 or

Hello. I started using the sem package in R and after a lot of searching and trying things I am still having difficulty. I get the following error message when I use the sem() function: Warning message: In sem.default(ram = ram, S = S, N = N, param.names = pars, var.names = vars, : Could not compute QR decomposition of Hessian. Optimization probably did not converge. I started with a

I just installed ruby, lighttpd, and mysql from darwinports on me laptop in lieu of the Apple version of ruby. Now when I fire up my rails application, it''s not running lighttpd anymore -- it''s running webrick. It also exits immediately. MySQL is running, the database and tables are restored from the backup. What step am I missing? Thanks for the help! Cheers, Hasan

I would like to get at all models in a rails application to be able to add a field to every one of them as part of a migration. Something like the following: Appmodels.each { |x| add_column x.table_name.to_s, :foo, :text } I understand I can get the table name using ActiveRecord::Base#table_name, but how do I get all the models into an array that I can use in the above manner? -- Cheers, Hasan

I''d like to implement the search capabilities of Ferret and am looking for sample code to see how it''s done. I''m thinking my controller creates the index when "Search" is clicked and a partial is rendered. What is this partial supposed to look like? Is it built in to rails/Ferret? Thanks for the help! Cheers, Hasan Diwan <hasan.diwan@gmail.com>

Hello Yesterday, i brought linksys PAP2 and have success with that. The only thing that does not go well is the music on hold. When i press 'hold' button from the telephone set instead of playing the music on hold that i have setup in Asterisk, Telephone Set plays its own MOH. Is there any way to tackle this issue. Regards Taimur Hasan -THQ- !!!ONE

Hello, I am trying to use nlm to estimate the parameters that minimize the following function: Predict<-function(M,c,z){ + v = c*M^z + return(v) + } M is a variable and c and z are parameters to be estimated. I then write the negative loglikelihood function assuming normal errors: nll<-function(M,V,c,z,s){ n<-length(Mean) logl<- -.5*n*log(2*pi) -.5*n*log(s) -

Hello, I am trying to randomly select rows with unique values in columns 1 and 2. I want to generate multiple subsets to estimate a statistic for each data set. Below is a simplified example. L1 L2 L3 L4 L5 1 a b 1 2 3 2 a c 4 5 6 3 a d 7 8 9 4 a e 10 11 12 5 a f 13 14 15 6 b c 16 17 18 7 b d 19 20 21 8 b e 22 23 24 9 b f 25 26 27 10 c d 28 29 30 11 c e

Hi All, We currently have our AD on Windows Server 2008 setup to work with Samba as a file share. I noticed on our event logs in Windows that we are getting warnings about a client performing LDAP binds without signing or using clear text LDAP. After enabling the logging for LDAP i have found this to be our Samba server performing these requests. I know how to solve the issue so that our

Dear R experts, I have been encountering problems with the "optim" routine using "for" loops. I am determining the optimal parameters of several nested models by minimizing the negative Log-Likelihood (NLL) of a dataset. The aim is to find the model which best describes the data. To this end, I am simulating artificial data sets based on the model with the least number

Dear all, I am trying to evaluate the optimisation behaviour of a function. Originally I have optimised a model with real data and got a set of parameters. Now I am creating simulated data sets based on these estimates. With these simulations I am estimating the parameters again to see how variable the estimation is. To this end I have written a loop which should generate a new simulated data

Dear list, I have the following problem : I want to model a series of observations of a given hospital activity on various days under various conditions. among my "outcomes" (dependent variables) is the number of patients for which a certain procedure is done. The problem is that, when no relevant patient is hospitalized on said day, there is no observation (for which the "number

Thanks a lot. One more thing if I may... Will I just download and install the packages from the http://packages.ubuntu.com ? On 7/28/16, Pino Toscano <ptoscano@redhat.com> wrote: > Hi, > > On Thursday, 28 July 2016 16:27:24 CEST M.H. Hasan Bhuiyan wrote: >> I am a newbie in coding. I am using ubuntu 14.04 in my machine and >> installed libguestfs by the following

Dear all, I am a PhD student working with Affymetrix HGU133atag array for analyzing the Latin square experiment. I was trying to generate gene expression index for hgu133atag array for PDNN model. While extracting the chiptype specific data structure, I got the following error- > library(affypdnn) Loading required package: affy Loading required package: Biobase Welcome to Bioconductor

Hi all, I am trying to find estimates for 7 parameters of a model which should fit real data. I have a function for the negative log likelihood (NLL) of the data. With optim(method="L-BFGS-B",lower=0) I am now minimizing the NLL to find the best fitting parameters. My problem is that the algorithm does not converge for certain data sets. I have read that one should scale the fn

Hi everyone? Does anybody know how can I estimate a Latent class multinomial (or conditional) logit using R? I have tried flexmix, poLCA, and they do not seem to support this model. thanks in advance adan -- View this message in context: http://r.789695.n4.nabble.com/Latent-class-multinomial-or-conditional-logit-using-R-tp4230083p4230083.html Sent from the R help mailing list archive at

Hello there, I would like to test the agreement amongst 6 raters for nominal data on a scale from 1-4, and conduct a latent class analysis in R. How should the data be formatted and what code should I use? Thank you very much Lisa Wang Princess Margaret Hospital Biostatistics tel:416 946 4501

Dear Listers, My post might be somewhat OT. Currently, I am trying to use flexmix to build a finite mixture model. For instance, I am getting the prior probability and coefficients for each latent class from training data. Is there a way to get the posterior probablity and prediction of a new dataset? What I am thinking is to apply the prior prob and coefficient from training set to testing data