Re: [R] Simulating points from GLM corresponding to new x-values

2009-08-13 Thread Jacob Nabe-Nielsen
Hi Cliff, Excellent, just what I needed -- wish I had thought of that myself. Thanks a lot! Jacob On 13 Aug 2009, at 01:49, Clifford Long wrote: Hi Jacob, At the risk of embarrassing myself, I gave it a shot. I'll throw this out on the list, if for no other reason than perhaps someone w

Re: [R] Simulating points from GLM corresponding to new x-values

2009-08-12 Thread Clifford Long
Hi Jacob, At the risk of embarrassing myself, I gave it a shot. I'll throw this out on the list, if for no other reason than perhaps someone with higher wattage than myself might tear it apart and give you something both useful and perhaps elegant (from an R coding standpoint). (see the followin

Re: [R] Simulating points from GLM corresponding to new x-values

2009-08-12 Thread Jacob Nabe-Nielsen
Hi Cliff -- thanks for the suggestion. I tried extracting the predicted mean and standard error using predict(). Afterwards I simulated the dependent variable using rnorm(), with mean and standard deviation taken from the predict() function (sd = sqrt(n)*se). The points obtained this way we

Re: [R] Simulating points from GLM corresponding to new x-values

2009-08-12 Thread Clifford Long
Would the "predict" routine (using 'newdata') do what you need? Cliff Long Hollister Incorporated On Wed, Aug 12, 2009 at 4:33 AM, Jacob Nabe-Nielsen wrote: > Dear List, > > Does anyone know how to simulate data from a GLM object correponding > to values of the independent (x) variable that do

[R] Simulating points from GLM corresponding to new x-values

2009-08-12 Thread Jacob Nabe-Nielsen
Dear List, Does anyone know how to simulate data from a GLM object correponding to values of the independent (x) variable that do not occur in the original dataset? I have tried using simulate(), but it generates a new value of the dependent variable corresponding to each of the original x-