search for: scherber

...0) w=cor(m,use="pairwise.complete.obs") How do I extract only those correlations that are >0.6? w[w>0.6] #obviously doesn?t work, and I can?t find a way around it. I would very much appreciate any help! Best wishes Christoph (using R 2.5.1 on Windows XP) -- Dr. Christoph Scherber DNPW, Agroecology University of Goettingen Waldweg 26 D-37073 Goettingen Germany phone +49(0)551 39 8807 fax +49(0)551 39 8806 homepage www.gwdg.de/~cscherb1

Dear all, I have a data frame that looks like this: c1 c2 c3 A B C B C A A A B and so on; I?d like to produce one single vector consisting of the columns c1,c2, c3, such that vector=("A","B","A","B","C","A","C","A","B") I guess it?s easy to do but I don?t know how...Can anyone

...y[1] Suppose I would like to replace the "x" by "w" in the formula object "y". How can this be done? Somehow, the methods that can be used in character objects do not work 1:1 in formula objects... Many thanks and best wishes Christoph -- Dr. rer.nat. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen Germany phone +49 (0)551 39 8807 fax +49 (0)551 39 8806 Homepage http://www.gwdg.de/~cscherb1

...arks instead of m1 m2 Do you know a way around this? I guess I would need to use expression() or substitute() but I don?t know how to construct m1, m2... without the quotation marks. Thanks very much for your help! Best wishes, Christoph (using R 2.5.1 on Windows XP SP2) -- Dr. Christoph Scherber DNPW, Agroecology University of Goettingen Waldweg 26 D-37073 Goettingen Germany phone +49(0)551 39 8807 fax +49(0)551 39 8806 homepage www.gwdg.de/~cscherb1

...ow would you deal with this kind of analysis? What would be your recommendation to the students, given the fact that most of the standard glm models obviously don?t seem to produce good fits here? Many thanks and best wishes Christoph (using R 2.8.0 on Windows XP) -- Dr. rer.nat. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen Germany phone +49 (0)551 39 8807 fax +49 (0)551 39 8806 Homepage http://www.gwdg.de/~cscherb1

Dear R users, I??ve got a simple question but somehow I can??t find the solution: I have a data frame with columns 1-5 containing one set of integer values, and columns 6-10 containing another set of integer values. Columns 6-10 contain NA??s at some places. I now want to calculate (1) the number of values in each row of columns 6-10 that were NA??s (2) the sum of all values on columns 1-5

1. If your code actually runs, you should upgrade R, and quit using `_' for assignment... 8-) 2. You seem to have an extraneous `]' after the na.exclude. Could that be the problem? Andy > From: Christoph Scherber > > actually, the situation is much more complicated. I am producing > multiple graphs within a "for" loop. For some strange reason, the > plotting routine always stops once lm(y~x) encounters more than one > missing value (I have marked the important bit with "**...

Dear all, Is there a way to retrieve standard errors from nls models? The help page tells me that arguments such as se.fit are ignored... Many thanks and best wishes Christoph -- Dr. rer.nat. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen Germany phone +49 (0)551 39 8807 fax +49 (0)551 39 8806 Homepage http://www.gwdg.de/~cscherb1

Dear R users, I am currently analyzing a dataset using lme(). The model I use has the following structure: model<-lme(response~Covariate+TreatmentA+TreatmentB,random=~1|Block/Plot,method="ML") When I plot the residuals against the fitted values, I see a clear positive trend (meaning that the variance increases with the mean). I tried to solve this issue using weights=varPower(),

Dear all, I?ve got a simple self-written function to calculate the mean + s.e. from arcsine-transformed data: backsin<-function(x,y,...){ backtransf<-list() backtransf$back<-((sin(x[x!="NA"]))^2)*100 backtransf$mback<-tapply(backtransf$back,y[x!="NA"],mean)

...ndom=~time|unique.ID.of.every.individual I have read that (2) is the only approach that works. But how could I then still include the nesting information from (1)? Many thanks for your help! Best wishes Christoph (using R 2.9.0 and the nlme library on Windows XP) -- Dr. rer.nat. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen Germany phone +49 (0)551 39 8807 fax +49 (0)551 39 8806 Homepage http://www.gwdg.de/~cscherb1

...on-zero rows in the matrix, P. Is that correct? And how can I assess if the matrix is orthogonal (given that it is non-symmetrical, hence det(P) and other matrix operations won?t work) Many thanks for your help! Best wishes Christoph. (using R 2.7.1 on Windows XP) -- Dr. rer.nat. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen Germany phone +49 (0)551 39 8807 fax +49 (0)551 39 8806 Homepage http://www.gwdg.de/~cscherb1

Dear all, I stumbled over a problem recently when trying to use srt with text() on a windows device. What I intended to do was to plot a simple regression line, and to rotate a piece of text such that the text has the same angle as the regression line. However, the text is always plotted in a slightly wrong angle: #### x=1:10 #create arbitrary x and y values y=x*2-rnorm(1:10)

...79) ## The last two lines of code are what I am stuck with; I thought using diag() on the SSPH and SSPE matrices should give me the sums of squares for hypothesis and error; so division should yield the F values? I would be most grateful for any help! Best wishes Christoph -- Dr. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen, Germany www.gwdg.de/~cscherb1

Dear all, I got this error message > library(dprep) > mardia(Savg) Error in cov(data) : 'x' is empty But with the same data, I got > library(mvnormtest) > mshapiro.test(Savg) Shapiro-Wilk normality test data: Z W = 0.9411, p-value = 0.6739 What does the error message "Error in cov(data) : 'x' is empty" mean? Thanks a lot! Jiao

Dear all, I am running Windows XP with several parallel installations of R (2.0.1; 2.1 and so on). How can I install JGR for the 2.0.1 version? I keep on getting error messages when trying to install it. Best wishes Christoph

Dear R users, Using xyplot(), how can I position the key in the *margin* outside the plotting area ? My problem is that the key always overlaps with the x axis labels, no matter how I try to specify any of the par() arguments (e.g. oma()). Many thanks for any suggestions! Christoph ### for information, here??s the code I use par(oma=c(0,0,3,0)) ###this, I think, is what should be changed

...red, but it "wastes" 5 df compared to the other models. Would it be allowed to select model3 instead, simply because it uses up less df and the delta-AIC between model2 and model3 is just 1? Many thanks for any suggestions/comments! Best wishes Christoph -- Dr. rer.nat. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen Germany phone +49 (0)551 39 8807 fax +49 (0)551 39 8806 Homepage http://www.gwdg.de/~cscherb1

Dear all, How can I extract the total and residual d.f. from a gnls object? I have tried str(summary(gnls.model)) and str(gnls.model) as well as gnls(), but couldn?t find the entry in the resulting lists. Many thanks! Best wishes Christoph -- Dr. rer.nat. Christoph Scherber University of Goettingen DNPW, Agroecology Waldweg 26 D-37073 Goettingen Germany phone +49 (0)551 39 8807 fax +49 (0)551 39 8806 Homepage http://www.gwdg.de/~cscherb1

Dear all, Is it possible to create a pdf file with layers using the pdf() device in R? Many thanks for your help! Christoph (using R 2.15.1 on Windows 7 64-Bit) -- PD Dr Christoph Scherber Georg-August University Goettingen Department of Crop Science Agroecology Grisebachstrasse 6 D-37077 Goettingen Germany phone 0049 (0)551 39 8807 fax 0049 (0)551 39 8806 http://www.gwdg.de/~cscherb1