similar to: what characteristics of model curve do parameters denote

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

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

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

Hi, I'm recompiling dovecot 2.2.0/2.2.1 with error below during make install: test -z "/usr/local/dovecot/lib/dovecot/auth" || /usr/bin/mkdir -p "/usr/local/dovecot/lib/dovecot/auth" /usr/bin/mkdir: cannot create directory ?/usr/local/dovecot/lib/dovecot/auth?: File exists make[3]: *** [install-auth_moduleLTLIBRARIES] Error 1 make[3]: Leaving directory

Dear all, I am making a barplot as following: barplot(c(1,2,3,5,2,3,1),names.arg=c("100","200","300","400","500","600","700"),xlab="diameter",ylab="flow",main="some title",space=0.1) I am also trying to add a probability density curve, however using lines(density(c(1,2,3,5,2,3,1))) does not give

Please give me some help, many thanks. I graphed a expected CDF line of a binomial distribution on a graph, And I have some observed points (observed CDF) from 4 groups fall on the smooth CDF line. I cannot really get the legend I want legend ('topleft', c('a, 'b', 'c', 'd', 'expected CDF'), col=c(1,2,3,4), pch=c(0,1,2, 3, '' ),

Hi, I find it's quite strange how condition dependent instructions are processed in PeepholeOptimizer::runOnMachineFunction: 01577 if ((isUncoalescableCopy(*MI) && 01578 optimizeUncoalescableCopy(MI, LocalMIs)) || 01579 (MI->isCompare() && optimizeCmpInstr(MI, &MBB)) || 01580 (MI->isSelect() && optimizeSelect(MI,

I'm trying to do a sort of home-brew item-characteristic-curve. This is a plot of the probability of getting a test item correct, as a function of the mean score on the test. (The last part is the home brew part.) Logistic regression with glm would work nicely, EXCEPT for the fact that the curve requires a guessing parameter. So the asymptote on the left is not 0 but rather something like

hello, I want to fit a curve to a simple x,y dataset - my problem is, that I want to fit it for the following term: n(1-e^x/y) - so I get the n constant for my data... can anyone help/comment on that? cheers, gregor

Hi everyone, I am writing a dovecot statistic plugin, which calls the 'mailbox_get_metadata' function with MAILBOX_METADATA_VIRTUAL_SIZE as the 2nd parameter. enum mailbox_status_items metadata_items = MAILBOX_METADATA_VIRTUAL_SIZE; struct mailbox_metadata metadata; mailbox_get_metadata(mailbox, metadata_items, &metadata); but Valgrind finds a memory leak when this function is

Hi, I have a local development environment and remote production environment, however I am really just learning/playing, hence I would like to be able to define these environments separately in the config files, however.... I would like my production environment to really act in a development mode fashion at the moment (i.e. sense updates I make without any need to restart things etc). Is

I'm reading about Local channel and applications. One fancy idea came up: if my generic dial plan uses Dial() with no timeout, can I assign it a timeout for special purposes by Dial(Local/some-exten@mycontext,,20) or even add other Dial() options. Well, I can't. (Maybe a feature request?) So this pseudo channel seems to lack some characteristics of a "real" one. Now the

The wiki <http://wiki.dovecot.org/Iptables> leads me to believe that the only way to configure dovecot to listen for the same protocol on multiple ports is via external redirection (iptables or similar). Is that so, or can dovecot be directly configured to listen on multiple ports? Here's a concrete example of what I'm trying to accomplish. Our environment uses plaintext

hey, I was wondering - is there an option to rsync which allows you to exclude transfers of files with a certain size or other characteristics? I want to setup a 'partial' rsync mirror where I only pull files under 5M, for example.. I see the option for including/excluding file names in the usage, but not file sizes.. Ed

Hi all I've a continuous variable and I want to test (graphically, plotting observed and theoretical distr, qqplot) whether it follows some formal distribution. (some thing close to Ricci document : Fitting distributions with R, Feb05). The distribution I want to fit is a truncated Gamma at 1 (the minimal value is 1), P(x)=Pgamma(rate,x)/(1-Pgamma(rate,x<1)) NB : changing the variable

I have a data set with many missing observations. When I run a regression, R of course discards the observations (the whole row) that have "NA". I want to tabulate some baseline characteristics (column means) but only for the observations that R used for the regression. I tried to recreate this data frame by using na.omit on the original data frame, but this will not work as this will

Hi all, I'm interested in doing a dot plot where *both* the size and color (more specifically, shade of grey) change with the associated value. I've found examples online for ggplot2 where you can scale the size of the dot with a value: http://had.co.nz/ggplot2/graphics/6a053f23cf5bdfe5155ab53d345a5e0b.png Or scale the color with the value:

Hi, We've been calling the function "source" (package base) from Tinn-R editor to send files, marked blocks and selections to R interpreter because it avoids a lot of problems related with input/output synchronization in the Rgui output. The new RGedit plugin is also using this function in this way. We (Jakson Aquino and I) are just finishing a new version of a plug in to Vim

Hi, I?m doing cca for a community data set in R and I have made a biplot for my data. Otherwise everything seems to be allright but the biplot is so messy I can?t read it well enough or publish it. I would like to get the row numbers out of the plot: I want the species position and the environmental variables in it as vectors but not the station numbers. How do I get them out? I have a raw