[R] Anova Type II and Contrasts

the study design of the data I have to analyse is simple. There is 1 control group (CTRL) and 2 different treatment groups (TREAT_1 and TREAT_2). The data also includes 2 covariates COV1 and COV2. I have been asked to check if there is a linear or quadratic treatment effect in the data. I crea

[R] Delete rows from data.frame matching a certain criteria

Hello, consider the following data.frame: test <- data.frame(n = c(1,2,3,4,5), v = c(6,5,7,5,3), pattern = c(1,1,NA,1,NA)) > test n v pattern 1 1 6 1 2 2 5 1 3 3 7 NA 4 4 5 1 5 5 3 NA I tried to use apply and the adply function to set v t

[R] Help on reshape function

Hello, I am trying to reshape a data.frame in wide format into long format. Although in the reshape R documentation they programmer list some examples I am struggling to bring my data.frame into long and then transform it back into wide format. The data.frame I look at is: df <- data.frame(ID1

Re: [R] Help on reshape function

Hey Michael, thanks for your help. I think the reshape2 library works much better than the normal reshape function. However, I still cannot retransform my data.frame into wide format once used melt function to transform it into long format. How do I get it back to wide format? The documentation, u

[R] Reshape data frame with dcast and melt

Hello, I implemented two functions reshape_long and reshape_wide (see full working example below) to reshape data frames. I created several small examples and the two functions seemed to work properly. However, using the reshape_wide function on my real data sets (about 200.000 to 300.000 rows) fa

[R] Help needed in interpreting linear models

Dear members of the R-help list, I have sent the email below to the R-SIG-ME list to ask for help in interpreting some R output of fitted linear models. Unfortunately, I haven't yet received any answers. As I am not sure if my email was sent successfully to the mailing list I am asking for help

Re: [R] Help needed in interpreting linear models

Hi Petr, thanks for your answer. First of all it's not homework I am a student and need to analyse cancer data using linear models. I looked into that topic since a week now and still struggling in interpreting some of the R output that is why I was asking for help here. I don't quite understand

[R] Relevel dynamically

Dear list, I am running R code which produces a data.frame with variable rows. For plotting purposes I need to relevel the column called "names" but since the dimension of the data.frame can vary I do not know how to dynamically revel the data.frame. Here is an example data.frame called df to i

Re: [R] Relevel dynamically

Hi Michael, yes you were right and your solution works great. thanks a lot. I managed to do it but with 4 lines of code rather than only 1. Cheers -- View this message in context: http://r.789695.n4.nabble.com/Relevel-dynamically-tp4299531p4300080.html Sent from the R help mailing list arch

[R] unlink: parameter "force" not available in R windows version

Hello, I use the R command unlink(file, recursive = TRUE, force = TRUE) to delete folders, subfolders and files on Mac OS X. When I was running my script on a Windows computer I realised that for unlink there is no option/parameter "force". I do not know why but without that "force" option R c

Re: [R] unlink: parameter "force" not available in R windows version

Hello, I am not exactly sure but I think the version which is installed on that windows computer is 2.13.x So it looks like that the people who developed that function recently updated it. I need to check that on Monday. Thanks for you answer. -- View this message in context: http://r.78969

Re: [R] unlink: parameter "force" not available in R windows version

Hi Brian, that explains it. I will update R to 2.14.x tomorrow. Thanks for your post. -- View this message in context: http://r.789695.n4.nabble.com/unlink-parameter-force-not-available-in-R-windows-version-tp4357464p4358761.html Sent from the R help mailing list archive at Nabble.com. _

[R] Problems reading tab-delim files using read.table and read.delim

Hello, I used read.xlsx to read in Excel files but for large files it turned out to be not very efficient. For that reason I use a programme which writes each sheet in an Excel file into tab-delim txt files. After that I tried using read.table and read.delim to read in those txt files. Unfortunate

[R] Outlier removal techniques

Hello, I need to analyse a data matrix with dimensions of 30x100. Before analysing the data there is, however, a need to remove outliers from the data. I read quite a lot about outlier removal already and I think the most common technique for that seems to be Principal Component Analysis (PCA). H