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...audience and should be well received by businesspeople, IT professionals, researchers, and students alike. Statistical Analysis with R takes readers on a journey from their first installation and launch of R, to analyzing and assessing data, to communicating and visualizing results. You can http://rtutorialseries.blogspot.com/2010/11/r-beginners-guide-book-update.html learn more about the book on my R Tutorial Series blog. The book itself can be found on the http://link.packtpub.com/or7f1u Packt Publishing website . If you have questions about the book, such as its content coverage, approach, audience,...

Hi, I was trying to figure out how to do post-hoc tests for Two Way ANOVAs and found the following 2 approaches: a. Do pairwise t-tests (bonferroni corrected) if one finds significance with the ANOVA. Link- http://rtutorialseries.blogspot.com/2011/01/r-tutorial-series-two-way-anova-with.html b. Do TukeyHSD on an aov model Link- http://www.r-bloggers.com/post-hoc-pairwise-comparisons-of-two-way-anova/ Running the data set given in the first example in SPSS gives significant pairwise difference for Treatment and Age (Tr...

Dear all, when trying to replicate John M. Quick's example for correlations between multiple variables posted on: http://rtutorialseries.blogspot.com/2009/11/r-tutorial-series-zero-order.html with R 2.11.0 (GUI 1.33) using my MacBook Pro with OX X 10.5.8 I got the following error message > datavar<-read.csv("dataset_readingTests.csv") > cor(datavar) Error in cor(datavar) : 'x' must be numeric The fun...

Hi all, I'm trying to run a repeated measures ANOVA on some univariate ecological data that was collected over two growing seasons. I ran the test using the methodology found on this website: http://rtutorialseries.blogspot.com/2011/02/r-tutorial-series-one-way-repeated.html Upon running the actual ANOVA I got this error message: "> rmanova=anova(yearmodel, idata=yearframe, idesign=~yearfactor) Warning message: In function (object, ..., test = c("Pillai", "Wilks", "Hotelli...

Hi, I am looking for a way to study some phase data with a circular distribution measured in rad.I would like to do a two way ANOVA (if possible mixed, with inter and intrasubject).I haven´t found a package that does that in R?Does sombeody know if there is one or how to do the analysis.Thanks in advance J ToledoCNDR UPenn [[alternative HTML version deleted]]

Hi, I performed an ANOVA repeated measures but I still can't find any good news regarding the possibility to perform multiple comparisons. Can anyone help me? Thanks Diego Bucci Fisiologia Veterinaria Dipartimento di Scienze Mediche Veterinarie Università degli Studi di Bologna Via Tolara di Sopra, 50 40064 Ozzano dell'Emilia, BO Tel. 00390512097904 mail diego.bucci3@unibo.it

...I think the problem is that somehow you are loading char string values in your matrix "datavar". Carlos On 10/05/2010 7:36 AM, Ruben Garcia Berasategui wrote: Dear all, when trying to replicate John M. Quick's example for correlations between multiple variables posted on: http://rtutorialseries.blogspot.com/2009/11/r-tutorial-series-zero-order.html with R 2.11.0 (GUI 1.33) using my MacBook Pro with OX X 10.5.8 I got the following error message datavar<-read.csv("dataset_readingTests.csv") cor(datavar) Error in cor(datavar) : 'x' must be numeric The funny thing...