search for: chemist

I apologize in advance for posting a question not related to R. I need references to papers that use multiple linear regression in an industrial application and also in a biological experiment. This is aimed to biologists/chemists (non-statisticans) so if anyone has written a brilliant paper where the use of multiple regression is important and also understandable to people with little knowledge of statistics and you like to be cited, please email me the reference off the list. To show the wide range of application I would...

...#x-adj is OK text(3,3, "adj=c(0,0)", adj=c(0,0)) text(3,3, "adj=c(1,0)", adj=c(1,0), col=2) [I am using r 2.7.1 in windows; adj behaviour is consistent in 2.6.0ff and for expressions as well as text] Perhaps a two-word correction to ?text ? Steve Ellison Lab of the Government Chemist UK ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}}

...;- c(1,2,3,4) exmpl <- c(3,3,4,2,3,1,2,3,4,8,8,23,1,2,3,4,4,34,4,3,2,1,1,2,3,4) how do I get the desired answer by finding the occurence of the pattern and returning the starting indices: 6, 13, 23 Suggestions very much appreciated! Kind regards, Matt Redding, Ph.D. Principal Scientist Geochemist/Soil Chemist Queensland Primary Industries & Fisheries DEEDI PO Box 102, Toowoomba, 4350, Qld ph: 0746 881372 fax: 0746 881192 ********************************DISCLAIMER**************...{{dropped:15}}

Hi Folks... No code to troubleshoot here. I need some suggestions about the right terminology to use in further searching, and any suggestions about R pkgs that might be appropriate. I am in the planning stages of a project in which IR, NMR and other spectra (I'm a chemist) would be collected on various samples, and individual samples would be followed over time. The spectra will be feature rich/complex, so one can't see the changes by visual inspection. The spectra are basically 2D matrices: peaks as a function of frequencies. So the data set is in the form o...

********************************************************** ** Dr. David Lucy ** ** Centre for Forensic Statistics and Legal Reasoning ** ** Department of Mathematics and Statistics ** ** The University of Edinburgh ** ** James Clerk Maxwell Building ** ** King's Buildings

...ction of R robust estimation packages (robust, robustbase and MASS being the obvious three) or on the Robust task view seems to cover this, though it's entirely possible I've missed something. Any pointers (to R packages or literature) gratefully accepted. S Ellison Lab of the Government Chemist, UK ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}}

Hello, I'm fairly new to R. I'm a chemist, not a programmer so please bear with me. I have a large data.frame that I want to break down (subset) into smaller data.frames for analysis. I would like to give the data.frames descriptive names which I have stored in a character vector. My original thought was that I want the subsets to show...

...r molecule. How do you coax R to find the optimal (smallest) set of descriptors to fit the data ? I am a new user of R. I am trying to learn the ins and outs of this powerful software. Sorry if this sounds like a trivial request. Thanks, Jim Metz James T. Metz, Ph.D. Computational Chemist 2119 Maple Creek Circle Ann Arbor, MI 48108 jmetz at comcast.net (H) 734-429-5075 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]su...

...alysis for the only the groups of interest, as the hazard ratio for any one group in an analysis with several groups is computed by holding the other groups at their average value, so the hazard ratio varies by the context. Seems like we need some sort of t-test or chi-squared test, but being mere chemists and molecular biologists, we don't quite see it and wouldn't trust ourselves anyway, given the special nature of survival analysis. Manual instructions or a function suggestion would be great. Thanks in Advance, Bryan ************* Bryan Hanson Professor of Chemistry & Biochemistry D...

Hi, I have a rectangular matrix and I need to check whether any columns are identical or not. Currently I'm looping over the columns and checking each column with all the others with identical(). However, as experience has shown me, getting rid of loops is a good idea :) Would anybody have any suggestions as to how I could do this job more efficiently. (It would be nice to know which

Small data sets (6-12 values, or a similarly small number of groups) which don't look nice and symmetric are quite common in my field (analytical chemistry and biological variants thereof), and often contain outliers or at least stragglers that I cannot simply discard. One of the things I occasionally do when I want to see what different assumptions do to my confidence intervals is to run a quick nonparametric bootstrap, just to get a feel for how a...

...e deeper reason for using @s? As the patch says, the API is undocmented, so my implementation might be off. It's certianly matches winxp's behavor (when run with --winver=winxp, that is); the dissasm is quite simple (god, I love IDA). -=- James Mastros -- "In the case of alchemy v chemistry the chemists know whether it will probably go bang before they try it (and the chemical engineers still duck anyway)." -=- Alan Cox

If this is off subject or has already been addressed, sorry. "Windows Genuine Advantage" looks like a move to make wine worthless. What I mean is that M$ development API pushes windows developers' applications to require you install IE 6.0 (soon 7.0) or later, making IE a key part of wine. If IE requires Genuine MicroSoft (Windows Genuine Advantage) to install, then most if not all

Hi, In our dev/int environemnts, our user base wants to be able to change managed files at will during the day but be notified via email of changes that happen. At night they want the files replaced to their known good state if there were changed. I tried to do this with a custom function that wraps two file types, one that just watches checksum, the other that does a reset of content with a

...lopment process.?????????????????????????????????? Requirements: MS, Ph.D. or equivalent experience in computer science or engineering with at least 2 years work experience at a pharmaceutical or biotech company.? The successful candidate will have recent experience interacting with Biologists or Chemists to develop and support scientific applications.? Excellent business analysis skills and demonstrated ability to work as part of a development team are essential.? Recent J2EE, Oracle and XML experience with working knowledge of the full software development lifecycle is required.? Programming and...

Is there a good way in R to impute values which exist, but are less than the detection level for an assay? Thanks, Jonathan Williams OPTIMA Radcliffe Infirmary Woodstock Road OXFORD OX2 6HE Tel +1865 (2)24356

"Select from a wide variety of brand name and generic rneds. It is legitimate to select licensed chemist-sites to place the or-der.,Customers have better selections for rnedicals on ereection dysfunction, pain, man's care, highcholesterol, stress and obesity. It is easier to stay healthier." [1]Embrace super value and check quality medicals on promo. "Check our...

...Thanks, ------------------------------------------------------------------- Rajarshi Guha <rxg218 at psu.edu> <http://jijo.cjb.net> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE ------------------------------------------------------------------- All theoretical chemistry is really physics; and all theoretical chemists know it. -- Richard P. Feynman

...baseform,cph,miced2,dated.sexrisk2,x=T,y=T) baseform is baseform<-Surv(si.age,si=="Yes")~ peer.press + copy.press + excited + worried + intimate.friend + am.pill.times + info.parents + info.teacher + info.sch.nurse + info.friends + info.media + info.clinic + info.gp + info.fpa + info.chemist + nearer.clinic + uti + thrush + herpes + love + strat(gender) + Own.space + ordered(Chat.Mother) + ordered(Chat.Father) + ordered(Prts.interested) + ordered(Someone.stands.up.4u) + Thought.runaway + as.numeric(Prts.know.location)+ pubty + partner + arguments + mfqc.total + esteem.total + events.to...

...e 'absence of evidence<>evidence of absence' debate, of course, it's not so relevant. The law generally requires evidence of _presence_ - although there's some contaminant legislation that causes problems by requiring demonstrated absence. Steve Ellison Lab of the Government Chemist ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}}