similar to: fitting a hyperbola to data points

Hello. I am working on an analysis involving the nonlinear mixed model function (nlme) in R. The data consist of measures of carbon fixation by leaves as a function of light intensity and the parametric function (standard in this area because it has a biological interpretation) is a non-rectangular hyperbola. I cannot get the nonlinear mixed model (nlme) function to converge cleanly. I am

I have got a data set that is Gross Primary Productivity ~ Total Suspended Solids it is a hyperbola just like: plot(1/c(1:1000)) how do I model this relationship so that I can get all of the neat things that lm gives residuals etc. etc. so that I can see if my eyeball model stands up. Thanks for any help, pointers, or good things to read. -- Stephen Sefick Research Scientist Southeastern

Does anyone know how to graph a line according to a specified equation? I'd like to plot the following hyperbola: Y=139.35/(1+(0.174*X)) I know there's a way to do this, but I'm having a ridiculous time trying to remember how. Thanks! Kyle H. Ambert Department of Behavioral Neuroscience Oregon Health & Science University [[alternative HTML version deleted]]

Hello. I am trying to fit a non-rectangular hyperbola function to data of photosynthetic rate vs. light intensity. There are 4 parameters that have to be estimated. I find the nls function very difficult to use because it often fails to converge and then gives out cryptic error messages. I have tried playing with the control parameters but this does not always help. Is there another

Hello. Following pages 342-347 of Pinheiro & Bates, I am trying to write a self-starting nonlinear function (a non-rectagular hyperbola) to be used in nonlinear least squares regression (and eventually for a mixed model). When I use the getInitial function for my self-starting function I get the following error message: > getInitial(photo~NRhyperbola(Irr,theta,Am,alpha,Rd),dat) Error

Hello. I am having a problem setting up a self-starting function for use in nonlinear regression (and eventually in the mixed model version). The function is a non-rectangular hyperbola - called "NRhyperbola" - which is used for fitting leaf photosynthetic rate to light intensity. It has one independent variable (Irr) and four parameters (theta, Am, alpha and Rd). I have created this

Dear R People: Could someone recommend a small example for spline regression, please? I would like to show this to my students, step by step. Thanks in advance, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: erinm.hodgess at gmail.com

Dear R Community, I am plotting this simple x-y plot (raw data & plot attached). I cant fit a linear regression line to it. I have to figure out what is the best fit for this graph. Is there a way to tell which regression to use for this kind of data? Also, after selecting the best fit model, I need to extrapolate what could be the other possible data points. I am new to R. Could anyone

I have a FreeBSD 6.2-based server running a 1.2TB graid3 volume, which consists of 5x 320gb SATA hard drives. I've been getting errors in /var/log/messages from the graid3 volume, which I suspect means an underlying fault with one of the disks, but is there any way to decipher which one of these drives is throwing errors? I've checked smartctl -a /dev/adXX but nothing shows up there..

Earlier, I posted a question concerning the syntax of nls() when the nonlinear function within the call is specified outside of nls(). Sundar showed me how to do this. Now I have a slightly more complex problem that is analogous to a broken-stick regression but in a non-linear context. I want my data to be fit to a non-rectangular hyperbola if the value of the independent variable (I) is less

Hi, I want to plot a polynomial in the form like ax^2 + bxy + cy^2 + dx + ey + f =0 without solving it(since I may have 3 or 4 dimensional polynomial and it's really hard to solve). Is there any way to plot this kind of polynomial? Thanks a lot! -- View this message in context: http://www.nabble.com/Plot-2-d-Polynomial-without-solving-it-tp24331313p24331313.html Sent from the R help

Hello dear R-devel list members. Following an old (2002) thread from R-help (and having myself needing to solve the same question): https://stat.ethz.ch/pipermail/r-help/2002-October/026249.html I patched the {base} function "merge.data.frame" to have it work with a new parameter called "keep_order", and I hope you might consider including this patch (or some variation of it)

On Thu, April 9, 2015 13:12, zep wrote: > frankly, this blows my mind. not long ago there was a huge kerfuffle > over the change to only allow (as someone defined it 'secure') certain > passwords, requiring numbers, special characters, some minimum length > and that -had to be done- because people didn't use proper passwords > and couldn't be trusted to just use

Hi I have been running 4 nodes in a distributed,replicated setup on gluster 3.3.1 since January. Each node has 10tb of storage to give a total of 20tb, for 2-3 years before that they were running on previous versions of gluster. Recently we had issues with the backend storage (ext4) on one of the nodes going read only, thats now resolved and I have ran the following and had errors. gluster

On Fri, 2015-04-10 at 09:07 -0400, James B. Byrne wrote: > On Thu, April 9, 2015 13:12, zep wrote: > > > frankly, this blows my mind. not long ago there was a huge kerfuffle > > over the change to only allow (as someone defined it 'secure') certain > > passwords, requiring numbers, special characters, some minimum length > > and that -had to be done-

A few days ago I posted a question to this discussion group concerning to origin of an error message < subscript out of bounds > while using the nonlinear mixed model (nlme) function in R with a self-starting function. Thanks for those who responded. This posting is to explain what (I think) it causing the error. Pinheiro & Bates (2000, pages 342-347) describe how to construct a

Hey all...I'm trying to use gnophone to connect to my asterisk box behind my firewall..I thought I could just setup a tunnel with something like ssh host.com -L5036:asteriskserver:5036 and just change my gnophone to connect to localhost:5036 but I never see anything happen on the asterisk server. I'm even trying this on the same network just in case there is something funky with NAT.

Dear mailing list, I have following array: X2 Y2 [1,] 422.7900 6.0 [2,] 469.8007 10.5 [3,] 483.9428 11.0 [4,] 532.4917 25.5 [5,] 596.1942 33.5 [6,] 630.8496 40.5 [7,] 733.2996 45.0 [8,] 946.4779 32.0 [9,] 996.8068 35.5 [10,] 1074.3310 23.0 I do afterwards the following: plot.new() plot.window(xlim=c(min(X1)-50,max(X1)+50),

Dear useRs, upon request, the VGAM package (currently version 0.7-1) has been officially released on CRAN (the package has been at my website http://www.stat.auckland.ac.nz/~yee/VGAM for a number of years now). VGAM implements a general framework for several classes of regression models using iteratively reweighted least squares (IRLS). The key ideas are Fisher scoring, generalized linear and

Hi folks, I installed the latest wine tarball. For some reason no applications work. I'm using on a Redhat 8.0/Windows XP dual boot system. Starting very simple applicatiosn doesnt work: Media Player: [root@mango Windows Media Player]# wine wmplayer.exe fixme:reg:_nt_dump_lf unknown Win XP node id 0x686c: do we need to add support for it ? fixme:reg:_nt_dump_lf unknown Win XP node id