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Thanks everyone, Paul -- View this message in context: http://www.nabble.com/PCA-and---variance-explained-tp19388970p19410675.html Sent from the R help mailing list archive at Nabble.com.

Thanks everyone -- View this message in context: http://www.nabble.com/Reorder-variables-in-a-dataframe-tp23647222p23660941.html Sent from the R help mailing list archive at Nabble.com.

That worked. Thanks a lot David - I appreciate it. Paul -- View this message in context: http://n4.nabble.com/Exclude-data-using-logical-tp1689992p1690090.html Sent from the R help mailing list archive at Nabble.com.

Many thanks Peter, This did indeed work. Regards, Paul -- View this message in context: http://n4.nabble.com/use-logical-in-cor-test-tp1744701p1746008.html Sent from the R help mailing list archive at Nabble.com.

Thanks a lot John - appreciate your help. Regards, Paul -- View this message in context: http://www.nabble.com/Q-about-how-to-use-Anova.mlm-tp21739443p21757533.html Sent from the R help mailing list archive at Nabble.com.

Hi, I'm wanting to test for a difference in medians between 2 groups using resampling methods. I found the boot package, but don't really understand how to write the 'statistic' function required as the 2nd argument for the...

After doing a PCA using princomp, how do you view how much each component contributes to variance in the dataset. I'm still quite new to the theory of PCA - I have a little idea about eigenvectors and eigenvalues (these...

Hi, Am wanting to save the summary of a PCA to file. Have tried: > write.table(summary(PCA), file="PCAvar.txt", sep="\t") but receive: Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors = stringsAsFactors) : cannot coerce class...

This is no doubt a very basic question for most R users, but is there an easy way to reorder the variables (columns) in a dataframe (I can't seem to find an answer anywhere). I've generally been creating...

Thanks Yihui and to others who replied privately. Very helpful information. Regards, Paul pgseye wrote: > > Hi, > > Am wanting to save the summary of a PCA to file. > > Have tried: > >> write.table(summary(PCA), file="PCAvar.txt", sep="\t") > > but receive...

Thanks a lot for that John - really helpful. I generated some random numbers and seem to be able to get it to work, so that's great. One thing - it's come up with a 'Type III' test and given...

Hi, I'm wanting to do a PCA on some data which is comprised of two different groups (to see how well the groups are discriminated). Is there a way to change the colour of the datapoints in a biplot...

Hi, I'm wanting to exclude data more than 2 sd's from the mean before proceeding with further analyses. I've created new logical variables (a and b) and written them to the existing dataframe. I want to be...

Hi, I'm learning to write some basic functions in R. For some data I have I'd like to be able to add a variable to itself after each iteration in a for loop to obtain a grandtotal for...

Hi, I'm essentially wanting to calculate intra- and inter-observer variabilities for the first principal component of an optic disc shape measure of a sample of individuals, so from what I can work out I need to work out...

Thanks for the replies. In response to Erik: What does > Both[,1] show you? > Both[,1] [1] 3.36 NA NA NA NA NA NA 3.92 3.50 NA NA NA NA 3.76 3.19 3.83 NA...

Hi, I'm very new to R. I want to know if there is any way to write only the lower half of a distance matrix created in R to a csv file for example. I get the 'cannot coerce...

Hi, Am newish to stats and R, so I certainly appreciate any help. Basically I have 50 inidividuals whom I have 6 photos each of their optic nerve head. I want to check that the orientation of the nerve head...

Hi, I've got 4 variables that I want to effectively 'stack' so that I have a grand R variable and a grand L variable. This works to achieve that goal: Twin1cor<-with(twin.wide,cbind(ACDepthR.1,ACDepthL.1...

Hi, I thought I'd like to try out JGR, but after installing the package (and dependencies) I receive the following when I try to load it: > library(JGR) Loading required package: rJava Loading required package: JavaGD Loading required package...