similar to: outlier tests

Hi! I'm trying to implement an outlier test once/row in a large dataframe. Ideally, I'd do this then add the Pvalue results and the number flagged as an outlier as two new separate columns to the dataframe. Grubbs outlier test requires a vector and I'm confused how to make each row of my dataframe a vector, followed by doing a Grubbs test for each row containing the vector of numbers

I have a statistical question. The data sets I am working with are right-skewed so I have been plotting the log transformations of my data. I am using a Grubbs Test to detect outliers in the data, but I get different outcomes depending on whether I run the test on the original data or the log(data). Here is one of the problematic sets: fgf2p50=c(1.563,2.161,2.529,2.726,2.442,5.047)

Hi, I need some help using the R outliers package. I would like to perform a Q-test (Dixon test) on my data set. I used the dixon.test function, but I cannot understand what is the confidence level used to perform the test. I have n=101 (n= number of data). So, can I use directly dixon.test ? What about qdixon and qtable functions? thank you so much! -- View this message in context:

Hello, everyone, I want to ask a simple question. If I have a set of data,and I want to identify how many outliers there are in the data.Which packages and functions can I use? Thanks. Shao chunxuan. [[alternative HTML version deleted]]

Hi Rers, W/o trying to make a long story short (I hope you read that correctly), I have been working on a nice little R function ... Somewhere along the line I got an error that refers to a max function in my function (I think this is a vector vs. scalar issue): Error in max(..., na.rm = na.rm) : invalid "mode" of argument If that's not bad enough, even when I q() R and say

I apologize if this has been addressed before; recently I read an article in Forbes which discussed how SCO was going after companies that have been using Linux. The article made the point that the ideas behind GPL are under attack precisely because no one is making sure that the code being put into the freely avail. packages isn't owned by someone else. Here's my question: Is R

Hello, I'm new in this R world and I don't know much about statistics, but now I have to analize some data and I've got some first queries yet: I have 5 sets of area mesures and each set has 5 repetitions. My first step is to check data looking for outliers. I've used the outliers package. I have to use the cochran test and the grubbs test in case I find any outlier. The problem

Dear R-users, Has anyone written a function for multifractal detrended fluctuation analysis? The "fractal" package does mono-fractal DFA, but not multifractal as far as I can tell. The MF-DFA approach is presented in: J. W. Kantelhardt, S. Zschiegner, E. Koscielny-Bunde, S. Havlin, A. Bunde, and H. E. Stanley, "Multifractal Detrended Fluctuation Analysis of

I have a question that must have a simple answer (but eludes me). I need a row-by-row logical comparison across three numeric variables in a data frame: foo$x, foo$y, foo$z. The logic is if( x < y || x > z ) 1 else 0 for a particular row. It is simple and very inefficient to use for(i in 1:length(foo$x)){ } loops. How can I accomplish this using sappy( ) / lapply( ) / apply( ) or

I would like to extend Dixon's values beyond 30. I've read over Rorabacher article but didn't understand the equations well enough to convert them to Excel and then "drag" the cells out extending the n. Rorabacher,_1991.pdf <http://r.789695.n4.nabble.com/file/n4649819/Rorabacher%2C_1991.pdf> Dean_&_Dixon,_1951.pdf

I have a SGI Altix 350 (ia64) that came with RHAS 4, but without any paid support. I would like to migrate the server over to CentOS. Here is what I've pieced together from some older posts by Johnny, can someone confirm this should work? I know this is somewhat covered in the FAQ, although both entries refer to FC or WBEL, which already have built-in yum support. Install the

I'm trying to get dovecot working with various clients on my new mailserver. I installed the base rc2 that comes with OpenBSD 4.0, then upgraded to rc14 when I ran into problems with TLS and Thunderbird. The server has no problems with Mail.app on my laptop, but any connection attempts from Thunderbird timeout after the TCP handshake. 13:53:41.074438 66.x.x.2.50483 >

Hi, I am a new user of R. This is a conceptual doubt regarding screeing out outliers from the dataset in regression. I read up that Cook's distance can be used and if we want to remove influential observations, we can use the metric (>4/n) (n=no of observations) to remove any outliers. I also came across Grubb's test to identify outliers in univariate distns. (assumed normal) but i

Hi folks: I've recently migrated one of my production servers (bad Jason!) from WBEL to CentOS 3.3 using Donavan's instructions in the FAQ (http://www.centos.org/modules/smartfaq/faq.php?faqid=19). While it was as painless as the document suggests, I've run into problems with postgrey (a postfix greylisting daemon) on my server. Whenever I try to start postgrey, I get the

R2.3, WinXP Dear all, I am using the following functions: f1 = Phi1+(Phi2-Phi1)/(1+exp((log(Phi3)-log(x))/exp(log(Phi4))) f2 = Phi1+(Phi2-Phi1)/(1+exp((log(Phi3)-log(r)-log(x))/exp(log(Phi4))) subject to the residual weighting Var(e[i]) = sigma^2 * abs( E(y) )^(2*Delta) Here is my question, in steps: 1. Function f1 is separately fitted to two different datasets corresponding to

I would like to do some fairly basic stem-and-leaf displays in R. I am aware (I might even say painfully aware) of stem(base) and have tried it. That's why I'm hoping someone has a usable stem- and-leaf display for R so that I don't have to write my own. r-project.org > Search > R Site Search > "stem and leaf display" finds nothing. I also tried the mail archive

I'm running Slackware 9.0 with a vanilla Linux kernel 2.4.25. Due to the announced EOL for 2.2.x, I'm trying to migrate our Samba hosts to version 3.0.5. These Samba hosts serve shares mounted off a seperate NFS fileserver. All is going well, except I've started getting the following messages in the smbd logs: ---- Start of snippet ---- [2004/08/11 09:59:30, 0]

The http://www.xapian.org/debian/archive_key.asc key file referenced on http://xapian.org/download.php is missing. Any chance it could be restored? Paul Dixon

Hi all- I have a Centos 3.6 server in production that hadn't been rebooted in quite some time. I was finally onsite today and took the chance to reboot into the most current kernel, but the box hung while "stopping iptables". Some Googling led me to one or two reports of systems hanging while the iptables initscript unloaded the modules. Has anyone else encountered this?

Hi All, I've browsed the history of the list, but can't seem to find an answer to something that I find quite surprising - why isn't --numeric-ids the default when rsync is told to preserve permissions? It seems to me that the current behaviour runs against the grain of more than a quarter century of unix tradition, and certainly caught me by surprise the first time I encountered it.