similar to: Interpreting parameters of sigmoid fct

Dear list, I'm trying to fit a chapman-richards equation to my data, only I cannot interpret the parameters a, b and d. I know that the parameter b denotes the asymptote, but for the others I couldn't figure out. But I do need to know this in order to set my starting values. Here's the model: modPoplar<- nls(Diameter ~ d*(1-exp(-b *Age))^a ,start=list(a=20,b=0.9,d=33)) I attached

Hi all, I have a problem with using NTBackup with SAMBA shares. I know about bug in version 3.0.x. I have SAMBA 1.9.18 at the moment on AIX machine and two Windows2003 Server. While trying to select SAMBA shares for backup I have "Access to this device or folder has been denied" error. This problem appears only on Win2003Srv. When I tried it on Win2kSrv with exactly the same

Hey List, I did a multiple regression and my final model looks as follows: model9<-lm(calP ~ nsP + I(st^2) + distPr + I(distPr^2)) Now I tried to predict the values for calP from this model using the following function: xv<-seq(0,89,by=1) yv<-predict(model9,list(distPr=xv,st=xv,nsP=xv)) The predicted values are however strange. Now I do not know weather just the model does not fit

Dear List, how can I obtain the value of r suqared for a non-linear model? For linear models it can be found in the summary() of the model but for non-linear models I just don't know. Please help! Anna

Hi list, I was wondering how I should go about fitting a sigmoid curve to a dataset. More specifically how I estimate parameters a and b in the following equation: 1 / 1+exp(-(x-a)*b) with b the steepness of the sigmoid curve and a the shift of the center of the sigmoid curve relative to the center of your dataframe. The fit is in function of x, the location within the input vector and y, an

I'm trying to plot an extrapolated logistic sigmoid curve using glm(..., family=binomial) as follows, but neither the fitted() points or the predict()ed curve are plotting correctly: > year <- c(2003+(6/12), 2004+(2/12), 2004+(10/12), 2005+(4/12)) > percent <- c(0.31, 0.43, 0.47, 0.50) > plot(year, percent, xlim=c(2003, 2007), ylim=c(0, 1)) > lm <- lm(percent ~ year)

Hello, This is a little off-topic. I have an Ericsson FCT f251m, according to the specs it supports call signalling through polarity reversals and loop break, but it's currently disabled. On my PSTN line, my TelCo does send polarity switchs to signal answer and hangup (answeronpolarityswitch=yes and hanguponpolarityswitch=yes in zapata.conf), and asterisk detects it alright. I've been

There's no reason that the optimum cannot be at the bounds. Bounded problems really do sometimes have solutions on those bounds. Compute the unconstrained gradient of your objective function at the bounds and see if the function is reduced when going across the bounds. The function here is assumed to be the neg. LL that one is MINIMIZING. There are many aspects of R, optimization in

Hi, We use a lot of "hash" in our program and we want to add a new function to the class, does someone know how to do this???? Thanks you very much Saiho The mind is its own place, and in itself. Can make a Heaven of Hell, a Hell of Heaven. http://www.geocities.com/sayoyo/ __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best

Dear List, does anyone know how I can test the strength of a correlation? Cheers, Anna

I am trying to write a function that fits a sigmoid given a X and Y vector guessing the start parameters. I use nls. What I did (enclosed) seems to work well with many data points but if I want to fit small vectors like : pressure <- c(5,15,9,35,45) gas <- c(1000,2000,3000,4000,5000) it do not work. The help page says that it do no not work on zero residual data. Massimo Cressoni

Dear Sirs, I?m writting a pam module for Radius authentication, which should allow a remote login via ssh on a Linux machine with an openssh server. In particular, the user which is configured at the remote Radius server is not present on the local user database of the Linux machine. Unfortunatly, openssh will not allow to start a PAM user authentication if cannot find the user login in the

Hi Alvin, Thanks for the help. :) This sounds good. My head also wrap about this problem. The question for me is why they use the smallest? Cheers Sven __ Sven Vogel Teamlead Platform EWERK DIGITAL GmbH Br?hl 24, D-04109 Leipzig P +49 341 42649 - 11 F +49 341 42649 - 18 S.Vogel@ewerk.com www.ewerk.com Gesch?ftsf?hrer: Dr. Erik Wende, Hendrik Schubert, Frank Richter Registergericht:

Hello @List, We have a pretty complex problem; In our company AD is the one and only directory service, all other "clients" need to follow the given settings and guidelines. We are connected via security ADS , but every patch session on the PDC `s is a nightmare , does it still work or not. So we think about alternatives to the existent situation, pls note , we do not have any

Hi I am having problems loading bcdw (http://bootcd.narod.ru) from the isolinux bootloader. I use this to load the acronis programs. It worked fine up till version 3.51 but does not work anymore with 3.52. Here is the code to load the second bootmanager label l kernel /bcdw/bcdwboot.bin Any insights to what might be wrong here? With 3.52 I get Error! Cannot load

Hi, I am running tinc on alpine linux 2.7.8 in 2 seperate environments. The first environment is running for about a month without any problems. The second environment causes some trouble. It looks like a memory leak on the client side. tincd.conf: ConnectTo=ServerHost Device=/dev/net/tun Mode=switch Name=ClientHost PMTUDiscovery = yes DeviceType=tap PriorityInheritance = yes

Hi, I''m new to XEN and have the following Problem: If I shutdown my domU the network of the dom0 leaks. A ping from another server to my xen dom0 shows a Packetloss > 80%. Then if I restart the domU after some seconds the ping show a loss from 0%. I retryed that 3 times but it is really hard to go to the dom0 via ssh and recreate the domU if the packetloss is that high. I used google

Hi, I've observed this strange behaviour for a while in my test environment. It looks like that all problems gone away when I switch to "hub-mode" instead of switch mode. Does tinc still work properly in switch mode when I transport vlan tagged traffic within that tunnel? In my environment the side, which is receiving arp requests from the wired interface, is running out of

Hello, I am using Dovecot 1.2.9 on a 32bit on Ubuntu 10.04.2 LTS. We got one user who uses folders in an "exessive" way. He has got 704 subscribed folders. That means about nearly 3000 folders on the filesystem. Since ~ a week the user couldn't work because of timeouts when connecting to Dovecot (IMAP). Thunderbird doesn't show any folders - timeout - the webmail System

Dear all, My company located in Innsbruck, Austria, has an opening for a biostatistician. If you have any interest, feel free to contact me or Dr Markus Speiser (markus.speiser*at*biocrates.com). Best regards, David ################## Biostatistician (m/f) Job Description BIOCRATES Life Sciences AG is a leading metabolomics company using a mass-spectrometry based technology