search for: chemometrician

...Not only your performance but also your personality matter to us. At BASF, careers develop from opportunities. BASF is one of the biggest foreign investors in China. For our Statistics Team currently being established at the Innovation Campus in SHANGHAI we are looking for a STATISTICIAN OR CHEMOMETRICIAN What you can expect: You provide statistical support based on data analysis, data-based modeling and optimization. This comprises chemometrics, biometrics, process and quality control, as well as econometrics and risk analysis. >From the beginning you will be responsible for projects in res...

...couldn't find function "lazyLoad" In addition: Warning message: package R.oo was built under R version 2.0.0 Error in library(R.oo) : .First.lib failed > Does anyone have any clues as to what I have done wrong? Thankyou for your help. Mike Griffiths Michael Griffiths, Ph.D. Chemometrician Training, Quality and Statistics Group LGC Limited Queens Road Teddington Middlesex, TW11 0LY, UK Tel: +44 (0)20 8943 7352 Fax: +44 (0)20 8943 2767 e-mail: michael.griffiths at lgc.co.uk ******************************************************************* This email and any attachments are confident...

Apologies to the listing, the problem was with the data set and not the code Thanks Michael Griffiths, Ph.D. Chemometrician Training, Quality and Statistics Group LGC Limited Queens Road Teddington Middlesex, TW11 0LY, UK Tel: +44 (0)20 8943 7352 Fax: +44 (0)20 8943 2767 e-mail: michael.griffiths at lgc.co.uk >>> "Michael Griffiths" <Michael.Griffiths at lgc.co.uk> 25/11/2004 11:20:56 >>&...

...comp(x) Error in princomp(x) : covariance matrix is not non-negative definite > Seeing this behavior on the matrix I tried, I hastily concluded that princomp was not suitable for this type (as similar functions are in many other software packages which are written for psychologists but not for chemometricians). ======================================================= However, the problem is not with the design of princomp in general, but with a little check it performs inside, which can have problems with roundoff: if (any(edc$values < 0)) stop("covariance matrix is not non-negati...

...comp(x) Error in princomp(x) : covariance matrix is not non-negative definite > Seeing this behavior on the matrix I tried, I hastily concluded that princomp was not suitable for this type (as similar functions are in many other software packages which are written for psychologists but not for chemometricians). ======================================================= However, the problem is not with the design of princomp in general, but with a little check it performs inside, which can have problems with roundoff: if (any(edc$values < 0)) stop("covariance matrix is not non-negati...

...omment; everyone has to start the learning process somewhere and lets face it, with a deadline looming and what appears to be an insurmaountable question wouldn't anyone ask for help? Signing off now.......maybe in a hour just to see some responses to these postings Michael Griffiths, Ph.D. Chemometrician Training, Quality and Statistics Group LGC Limited Queens Road Teddington Middlesex, TW11 0LY, UK Tel: +44 (0)20 8943 7352 Fax: +44 (0)20 8943 2767 e-mail: michael.griffiths at lgc.co.uk >>> Ron??n Conroy <rconroy at rcsi.ie> 02/12/2004 09:10:05 >>> As a person new to R, I...

...# group entered as group=subset(sub2, factor(Analyte)=="Cholesterol") for example # # # # # Please ignore the commented out lines, these were put in for my own use. The code gave the same error message with them removed. Thankyou for your help Mike Griffiths Michael Griffiths, Ph.D. Chemometrician Training, Quality and Statistics Group LGC Limited Queens Road Teddington Middlesex, TW11 0LY, UK Tel: +44 (0)20 8943 7352 Fax: +44 (0)20 8943 2767 e-mail: michael.griffiths at lgc.co.uk ******************************************************************* This email and any attachments are confident...

Dear R gurus, I have some climatic data for a region of the world. They are monthly averages 1950 -2000 of precipitation (12 months), minimum temperature (12 months), maximum temperature (12 months). I have scaled them to 2 km x 2km cells, and I have around 75,000 cells. I need to feed them into a statistical model as co-variates, to use them to predict a response variable. The climatic