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Dear All, I was using set.seed to reproduce the same results for the discrete event simulation model. I have 12 unknown parameters for optimization (just a little background). I got a good fit of parameter combinations. However, when I...
Dear All, I am analyzing trial data for survival. During the loading of the R package "flexsurv", the following error message appeared. "Loading required package: survival Error: package or namespace load failed for ?flexsurv? in loadNamespace(j <- i[[1L]], c...
Hello everyone, I am using the "parallel" R package for parallel computation. Code: # set number of cores cl <- makeCluster(8, type = "PSOCK") # Mac/Linux need to set as "FORK" # pass functions and objects to the cluster environment and set seed...
Dear all, I am using optim() to estimate unknown parameters by minimizing the residual sums of squares. I created a function with the model. The model is working fine. The optim function is producing negative parameter values, even I have...
Hello everyone, I am using the LHS package to generate a combination of a set of parameter values. However, I am not sure how to fix some parameter values to 2 decimal points. For example: I want to make combinations...
I am designing a programme in R to simulate two events that are 1. a person gets cancer, or 2. die of other causes. I have data for the probability of getting cancer by age and probability of death due...
Dear Petr, It is more than 2000 lines of code with a lot of functions and data inputs. I am not sure whether it would be useful to upload it. However, you are absolutely right. I used Step 1. Self...
Dear All, Thanks a lot for your valuable suggestions. I am going to implement one by one. Jan: Yes, I am using the "doParallel" package for parallelization. I will let you know the results after implementing all the given suggestions...
Hi Richard and Jim Thanks for your response. Sorry for the confusion. This is lhs package (small letters), and after loading the package, I used the function randomLHS. The problem remained the same. I am trying to fix the length...
Dear All, I would like to know that is there any problem in *expand.grid* function or it is a limitation of this function. I am trying to create a combination of elements using expand.grid function. A <- expand.grid...
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