search for: toxicology

Hello, I would like to use a permanova to analyze my repeated measures, multivariate data set using the package vegan (adonis function). I have several explanatory variables and many clinical biochemistry/hematological response variables (all continuous, non-normally distributed). My explanatory variables are: ID - 29 levels - individual subjects Treatment - 2 levels Sex - 2 levels Time -

Below. -- Bert On Tue, Apr 3, 2012 at 1:47 PM, Danielle Duncan <dlduncan2 at alaska.edu> wrote: > Thanks for the response, I should have clarified that the NOEL is the > smallest dose above which there is a statistically significant effect. > This is not a scientifically meaningful nor defensible definition as it is stochastic, depends on the test used, design, level chosen, etc.

Hello, I used the glm function in R to fit a dose-response relationship and then have been using dose.p to calculate the LC50, however I would like to calculate the NOEL (no observed effect level), ie the lowest dose above which responses start occurring. Does anyone know how to do this? [[alternative HTML version deleted]]

INSTITUTE OF OCCUPATIONAL MEDICINE, EDINBURGH Research Scientist, Statistics and Toxicology Section Salary ?19,000 to ?36,000 We are seeking to appoint a Research Scientist to join the Statistics and Toxicology Section in our Research Division to work on a variety of research and review projects undertaken by the team. This will be a permanent post based in our Edinburgh office....

...ented in plot or plot.default. plot.default resets xaxp, and leaves xaxp reset when it exits: par(xaxp=c(0,1,4)) print(par("xaxp")) plot(c(0,1),c(0.2,0.3)) print(par("xaxp")) R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-5394 Pharmacokinetics Branch NHEERL MD-74; US EPA; RTP, NC 27711 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "h...

...(z <- a + b),expression(z^2)) Error in as.function.default(c(formals(f), value), envir) : invalid formal argument list for "function" Can someone give me a simple example for doing this? Thanks! R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-4284 Pharmacokinetics Branch NHEERL B143-05; US EPA; RTP, NC 27711

...out how to pass the pointer through .Call or .External. Is this possible, or should I pass a string through to the compiled code, and find the pointer on that side (and how to do that)? Thanks. R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-5394 Pharmacokinetics Branch NHEERL MD-74; US EPA; RTP, NC 27711 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "h...

...nor = 6.2 year = 2003 month = 01 day = 10 language = R Windows 2000 Professional (build 2195) Service Pack 2.0 Search Path: .GlobalEnv, package:OPmodels, package:odesolve, package:ctest, Autoloads, package:base R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-4284 Pharmacokinetics Branch NHEERL B143-05; US EPA; RTP, NC 27711

...rch = mips os = irix6.5 system = mips, irix6.5 status = major = 1 minor = 2.1 year = 2001 month = 01 day = 15 language = R Search Path: .GlobalEnv, package:ctest, Autoloads, package:base R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-5394 Pharmacokinetics Branch NHEERL MD-74; US EPA; RTP, NC 27711 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "h...

...3.1 year = 2001 month = 08 day = 31 language = R Windows 98 SE 4.10 (build 2222) A Search Path: .GlobalEnv, package:ctest, package:RBMDS, package:nls, package:nlme, Autoloads, package:base R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-5394 Pharmacokinetics Branch NHEERL MD-74; US EPA; RTP, NC 27711 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "h...

...le through the windows help system. platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 1 minor 5.1 year 2002 month 06 day 17 language R R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-5394 Pharmacokinetics Branch NHEERL MD-74; US EPA; RTP, NC 27711 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", &quot...

...pe (null) Error: Page count in top-level pages object is incorrect Error: Couldn't read page catalog If I eliminate 32 plots, the file renders correctly in xpdf (I haven't tried Acroread). R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-5394 Pharmacokinetics Branch NHEERL MD-74; US EPA; RTP, NC 27711 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "h...

...ximum exists and then splitting the?data around those maxima. Would that be a ("brute-force") solution? But I'll still lack a pvalue to check the fit... ? Thanks in advance for your time. ? Kind regards. ? Thomas Sbarrato PhD Student/Part-Time Researcher ?? Medical Research Council ?? Toxicology Unit ?? University of Leicester ?? Lancaster Road, Leicester ?? LE1 9HN, UK Tel: +44 (0)116 252 5591Thomas Sbarrato PhD Student/Part-Time Researcher Medical Research Council Toxicology Unit University of Leicester Lancaster Road, Leicester LE1 9HN, UK Tel: +44 (0)116 252 5591 Email:...

...e.g: ggplot(.... +xlab(expression(.^207*"Pb/"*.^206*"Pb"))+ylab(expression(.^208*"Pb/"*.^206*"Pb") I have searched for this and have not had any luck so far... any suggestions? VR Jim James T. Durant, MSPH, CIH Emergency Response Coordinator DIvision of Toxicology and Environmental Medicine US Agency for Toxic Substances and Disease Registy Mailing Address: 4770 Buford Highway, MS F-62 Atlanta, Georgia 30341 Telephone: 770-488-0668 (office) 770-378-1695 (cell) [[alternative HTML version deleted]]

Hello, We are a group of PhD students working in the field of toxicology. Several of us have small data sets with N=10-15. Our research is mainly about the association between an exposure and an effect, so preferrably we would like to use linear regression models. However, most of the time our data do not fulfill the model assumptions for linear models ( no normality of...

Greetings, I have a question that I'd like to get input on. I have a classic toxicology study where I artificially fertilized and exposed embryos to a chemical and counted defects. In addition, I kept track of male-female pairs that I used to artificially fertilize and generate embryos with. I need to use logistic regression to model the response, but also check that the genetics of t...

Hello there, Suppose you want to solve the following system of ODE's (a simple Lotka-Volterra predator prey model) dP/dt = beta*P*V - mu*P dV/dt = r*V - beta*P*V where P and V are the numbers of predators and prey. Now, this is easy to do, but suppose you have a system of equations like this, dP1/dt = beta1*P1*V1 - mu1*P1 dP2/dt = beta2*P2*V2 - mu2*P2 dV1/dt = r1*V1 - beta1*P1*V1

...change line 37 in rw1023/bin/Remove: from my @knownoptions = ("help|h", "version|v"); to my @knownoptions = ("help|h", "library|l:s", "version|v"); R. Woodrow Setzer, Jr. Phone: (919) 541-0128 Experimental Toxicology Division Fax: (919) 541-5394 Pharmacokinetics Branch NHEERL MD-74; US EPA; RTP, NC 27711 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", &quot...

...s) in plots for a hclust object for better visualization? I have looked through plot, points, hclust and more but cannot find anything on label color. Anybody know if this is doable? Best regards Jeppe ___________________________________ Jeppe Skytte Spicker Ph.d. student Virology and Molecular Toxicology Novo Nordisk A/S Novo Nordisk Park DK-2760 Måløv Denmark 44438733 (direct) jspc@novonordisk.dk This e-mail (including any attachments) is intended for the addressee(s) stated above only and may contain confidential information protected by law. You are hereby notified that any unauthorised readin...

...in PHP, so I may just be "conceptually" confused about how to do this. Any help would be greatly appreciated. thanks in advance, Dries Knapen ******************************************** Dr. Dries Knapen University of Antwerp Department of Biology Ecophysiology, Biochemistry and Toxicology Groenenborgerlaan 171 - U711, B-2020 Antwerp Belgium tel ++32 3 265 33 49 fax ++32 3 265 34 97