search for: admodel

...nlinear robust regression, > > analogous to e.g. LTS? > > > > Searching google I have found > > 1, an abstract to generalize LTS for nonlinear regression > > models, see: http://smealsearch.psu.edu/1509.html > > 2, an AD-model builder, see: http://otter-rsch.com/admodel/cc1.html > > but no mention of R/S > > > > Thank you in advance > > Best regards > > Christian > > _._._._._._._._._._._._._._._._ > > C.h.i.s.t.i.a.n S.t.r.a.t.o.w.a > > V.i.e.n.n.a A.u.s.t.r.i.a > > _._._._._._._._._._._._._._._._ >...

I have a loop that increases the size of an object after each iteration. When the Windows Task Manager shows "Mem Usage" about 1.8GB, the Rgui.exe process no longer responds. I use: "C:\Program Files\R\rw1080\bin\Rgui.exe" --max-mem-size=4000M --min-vsize=10M --max-vsize=3000M --min-nsize=500k --max-nsize=1000M I have a dual Xeon 2.8GHz processor box with 4GB of memory and

Hello, I am using odesolve to simulate a group of people moving through time and transmitting infections to one another. In Matlab, there is a NonNegative option which tells the Matlab solver to keep the vector elements of the ODE solution non-negative at all times. What is the right way to do this in R? Thanks, Jeremy P.S., Below is a simplified version of the code I use to try to do this,

Dear all, I have a serious problem to solve my model. I study over exploitation of fish in the bay of biscay (france). I know only the level of catch and the fishing effort (see data below) by year. My model is composed by the following equations: * the growth function Gt(St) = r*St*(1-St/sbar) with Gt the growth of each period t r intrinsec growth of the stock sbar carriyng capacity of the

Hi, I'm trying to use Robust non-linear regression to fit dose response curves. Maybe I didnt look good enough, but I dind't find robust methods for NON linear regression implemented in R. A method that looked good to me but is unfortunately not (yet) implemented in R is described in http://www.graphpad.com/articles/RobustNonlinearRegression_files/frame.htm

...r the log-likelihood with the different packages and methods. We thought it would be interesting to revisit this example using the AD Model Builder random effects module which we feel is the most stable software available for this problem at this time. http://otter-rsch.com/admodel.htm You can get Table 2 from Lesaffre et al at http://otter-rsch.com/downloads/other/lesaffre.pdf The data and more information are available from the publisher. http://www.blackwellpublishers.co.uk/rss/Volumes/Cv50p3.htm We considered three questions: 1...

Hello, I am trying to find the analytical solution to this differential equation dR/dt = k1*(R^k2)*(1-(R/Rmax)); R(0) = Ro k1 and k2 are parameters that need to fitted, while Ro and Rmax are the baseline and max value (which can be fitted or fixed). The response (R) increases initially at an exponential rate governed by the rate constants k1 and k2. Response has a S-shaped curve as a function