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References: [ +from:Christoph.Scherber@uni-jena.de: 28 ]

Total 28 documents matching your query.

1. arcsine transformation with negative values (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Tue, 21 Feb 2006 20:48:31 +0100
Dear S list members, I am currently analyzing a dataset that consists of differences of percentage values - i.e., the values may range from -100% to +100%. How can I transform these data in order to
/archives/html/s-news/2006-02/msg00072.html (7,156 bytes)

2. xyplot() and panel.superpose (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Thu, 10 Feb 2005 15:12:14 +0100
Dear S-Users, I have an xyplot() where different plotting symbols are used for subgroups. How can I fit separate regression lines for every subgroup? So far, I can only plot the overall fitted line.
/archives/html/s-news/2005-02/msg00048.html (7,448 bytes)

3. grouped boxplot (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Fri, 11 Feb 2005 14:35:27 +0100
Dear S users, I have a model with the following structure: response~block + treatment where block has 4 levels and treatment has 2 levels (continuous response). I´d like to create a grouped boxplo
/archives/html/s-news/2005-02/msg00053.html (7,168 bytes)

4. y axis problems (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Mon, 25 Oct 2004 13:43:55 +0200
Dear S-Plus users, I have a small but serious problem when trying to add editable y-axis labels to a plot. The command syntax I´m using is: plot(x,y,cex=1.5,type="n",axes=F,xlab="",ylab="mean leaf
/archives/html/s-news/2004-10/msg00124.html (7,333 bytes)

5. contrasts in ANOVA (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Tue, 03 Aug 2004 14:24:28 +0200
Dear all, Suppose I have a one-way ANOVA with a factor ("resistance") for which two different contrasts have been defined as shown below; I would like to have an ANOVA output which gives me the SS at
/archives/html/s-news/2004-08/msg00007.html (8,018 bytes)

6. log-linear contrasts (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Sun, 08 Aug 2004 15:10:09 +0200
Dear all, if I have an ANOVA with a factor of class ordered(), how can I construct log-linear contrasts (instead of linear, quadratic, cubic...contrasts) for this factor? Thanks for any help, Christo
/archives/html/s-news/2004-08/msg00035.html (6,518 bytes)

7. summing over parts of a data.frame (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Mon, 05 Jul 2004 13:52:54 +0200
Dear all, I have a (n x k ) dataframe (with n rows and k columns), and I would like to sum over every row (including only the 4th to kth column), such that I´d have a variable containing the row su
/archives/html/s-news/2004-07/msg00007.html (7,498 bytes)

8. categorical response variable (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Tue, 06 Jul 2004 15:57:04 +0200
Dear all, how can I analyze a dataset where my response variable is categorical? The dataset looks like this: year species area aggr 2001 1 1 "0" 2001 1 2 "0" 2001 1 1 "0" 2001 2 2 "1" 2001 2 1 "1" 2
/archives/html/s-news/2004-07/msg00013.html (7,527 bytes)

9. analysis of covariance question (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Wed, 28 Jul 2004 23:00:40 +0200
Dear list members, I have an S-Plus ANCOVA model where one variable is both included as a factor and as a linear covariate within the same model, such that, e.g.: model <- response ~ Xlinear + Xfacto
/archives/html/s-news/2004-07/msg00149.html (7,424 bytes)

10. boxplot confidence intervals (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Mon, 01 Mar 2004 13:26:50 +0100
Dear list members, I´ve got some questions regarding computations with regard to the "boxplot" command: (1) How does the computation of confidence intervals for the median in "boxplot" work? (1a) A
/archives/html/s-news/2004-03/msg00001.html (7,410 bytes)

11. mcheck function (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Thu, 04 Mar 2004 17:07:31 +0100
Dear all, is there a "mcheck" function in S (just as there is one in R)? Regards Christoph
/archives/html/s-news/2004-03/msg00046.html (7,586 bytes)

12. Re: mcheck function (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Thu, 04 Mar 2004 18:17:37 +0100
Dear Spencer, The mcheck function comes from Crawley, M.J. (2002) Statistical Computing. An introduction to data analysis using S-Plus. Wiley & Sons Ltd., NY, USA. mcheck<-function(obj,...){ rs<-obj$
/archives/html/s-news/2004-03/msg00048.html (8,228 bytes)

13. quantile regression (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Fri, 12 Mar 2004 11:21:36 +0100
Dear colleagues, How can I do quantile regression with S-Plus? Many thanks for your help! Regards, Chris.
/archives/html/s-news/2004-03/msg00119.html (6,556 bytes)

14. mixed effects model (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Wed, 11 Feb 2004 11:38:18 +0100
Dear list members, I´ve fitted a LME to data consisting of a mix of categorical and numeric variables in data from a split-plot experiment. consumption is the response A, B are integer variables tr
/archives/html/s-news/2004-02/msg00083.html (7,581 bytes)

15. AIC for split-plot ANOVA (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Tue, 17 Feb 2004 15:16:00 +0100
Dear all, is it possible to calculate the Akaike Information Criterion (AIC) for a split-plot ANOVA model in S-Plus? the model looks like model1_aov(response~factors+Error(Plot/Treatment)) Additional
/archives/html/s-news/2004-02/msg00128.html (7,200 bytes)

16. Re: AIC for split-plot ANOVA (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Tue, 17 Feb 2004 19:01:55 +0100
Dear Prof. Ripley, Is there, then, any way to compare different split-plot-ANOVA models with each other? suppose I have two models with model1_aov(response~var1+var2+Error(Block/Plot)) model2_aov(res
/archives/html/s-news/2004-02/msg00134.html (10,288 bytes)

17. NA´s in ANOV (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Wed, 18 Feb 2004 17:06:42 +0100
Dear all, How can I exclude NA´s from an aov model? I´ve been thinking of something like model_aov(response~factor,na.action=na.exclude) but this doesn´t seem to work. Thanks for any suggestions! C
/archives/html/s-news/2004-02/msg00147.html (6,540 bytes)

18. ancova model checking (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Mon, 23 Feb 2004 13:45:31 +0100
Dear all, I have several partially correlated explanatory variables that I want to analyse using analysis of covariance. The problem now is that order in model specification matters. I would therefor
/archives/html/s-news/2004-02/msg00183.html (7,466 bytes)

19. Levene test (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Wed, 25 Feb 2004 13:55:00 +0100
Dear all, is there a way to perform a Levene´s test for variance homogeneity in S-Plus? Best wishes Chri
/archives/html/s-news/2004-02/msg00207.html (6,704 bytes)

20. Re: Levene test (score: 1)
Author: Christoph Scherber <Christoph.Scherber@uni-jena.de>
Date: Wed, 25 Feb 2004 16:46:48 +0100
Dear John, Thanks - that was exactly what I was looking for - really great. Just one slight correction: S-Plus doesn´t know the function "rownames". The correct code therefore is as stated below, u
/archives/html/s-news/2004-02/msg00210.html (9,051 bytes)

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