similar to: R help

Hi, How to convert a var-covar matrix to correlation matrix. Thanks --------------------------------- [[alternate HTML version deleted]]

Hallo all just a small question I did not find an answer in help pages. Is it possible to use identify() after plotting with plot.POSIX to label points and/or to find out some points? Thanks a lot. Best regards Petr Pikal petr.pikal at precheza.cz p.pik at volny.cz

Dear R users I searched some sources but i did not find an answer.Please give me some hint to following problem. I would like to compute a summary statistic for some vector for different factor levels. I know I can use tapply or aggregate but I do not know if there is a way how to use function with several (two) variable input (like weighted.mean). I wrote a simple a function for factor

Dear friends, I try to get started with R and can’t estimate kurtosis of a random sample by using one command. I have installed R 1.6.2. Please help. Max --------------------------------- ur needs [[alternate HTML version deleted]]

Greetings, Does anyone know how to get an id number in the little header above each individual plot within a trellis plot? The default seems to be to print the word id and add a line indicating on a linear scale where the current id sits. Thanks in advance for any help you can send, Suzette ================================= Suzette Blanchard, Ph.D. Research Scientist Frontier Science

Dear all I try to persuade if statement in my function to work as I want (but I am not very successful:( My question is why my function with if statement is evaluated correctly in case of atomic variables and incorrectly in case of vector variables. Here is an example: #function with if statement fff <- function(otac,sklon) { test <- (otac *

Dear all I have a function in which I would like to change some values to NA according to some condition. dropout<-function(y, nahr=FALSE,...) { <some stuff for computing an index> if (nahr) y[index]<<-NA invisible(index) } in case y is a vector all works OK but if it is a part of data frame by calling dropout(df$y) or dropout(df[,number]) no change is done. Please can you

Dear R users I use R (1.3.0) Windows version usually with connection to Excel sheets via RODBC Version: 0.8-2. Everything is OK until I use mixed data types (numeric and character) in one column. In that case I will get a particular column of data frame with NA's. Example vzorek lpas apas NA 51.240 20.26 NA 51.340 20.42 NA 49.770 22.05 RB 12 49.840 19.30 RB 12 49.880

Dear R users, I'm having trouble using aggregate() and would greatly appreciate your advice. I am using R 1.5.1 on Windows 2000. I want to call my function in the following way extract.data(x=dat[, "Age", "Year"]) where extract.data() uses aggregate() to count the number of cases for each combination of "Age" and "Year". I've defined

Dear all I have a character vector of dates something like: timevec<-c("15.5.2003 00:00", "15.5.2003 00:01", "15.5.2003 00:02", "15.5.2003 00:03","15.5.2003 00:04") and I would like to transform it to some more convenient date class. Is there a way how to do it directly without previous reformating to ISO like structure and adding a

Dear all I would like to aggregate a data frame in a three minute interval. I have a time vector: > str(cas.param) `POSIXct', format: chr [1:181] "2003-06-12 09:00:00" "2003-06-12 09:01:00" "2003-06-12 09:02:00" and I want to turn it into a factor by cut. It works if I want to break it in let say hours > str(cut(cas.param,breaks="hour"))

Dear all Please, is there any function or package for dealing with multimodal distributions? I try to fit multimodal distribution or more precisely to find out mixture of normal distributions which can lead to my actual data. I use optim to find (in that case) two parameters but what I want is to let the function find out arbitrary number of normal distributions underlaying my actual data

Subject: Eliminate repeated components from a vector X-Mailer: VM 7.00 under 21.4 (patch 6) "Common Lisp" XEmacs Lucid Reply-To: fjmolina at lbl.gov FCC: /home/f/.xemacs/mail/sent Does anyone know how I can eliminate repeated elements from a vector?

Just out of curiosity, can some please explain the following return NA. x <- 6 var(x) y <- c( NA, NA, 10000 ) var(y, na.rm=T) Unless I am seriously misguided, I believe that the variance of a single number (i.e. a constant) should be zero. Thanks. Regards, Adai.

I am trying to fit a lognormal distribution to a set of data and test its goodness of fit with regard to predicted values. I managed to get so far: > y <- c(2,6,2,3,6,7,6,10,11,6,12,9,15,11,15,8,9,12,6,5) > library(MASS) > fitdistr(y,"lognormal",start=list(meanlog=0.1,sdlog=0.1)) meanlog sdlog 1.94810515 0.57091032 (0.12765945) (0.09034437) But I would

Hi: How do I find average across three columns such as weight1, weight2, weight3 (20 people, each person has three different measures)? They have NA's also. Thanks Tom, Univ of Pittsburgh, ttrut at yahoo.com

Hello. Is there an easy-to-use contour plot function analogous to scatterplot3d that can draw handle a dataset of arbitrary (x,y,z) triplets? That is, say x, y, and z are each measured quanties, and exhibit neither order nor regularity. I looked at the lattice package function "contourplot" but it seems complicated, and it's not clear from the documentation whether it can

Hello! I have a dataset with NA's in some variables (factors), for example: $ P67 : Factor w/ 2 levels "-","+": NA 2 1 NA NA 2 1 1 2 NA ... I need to use 'xtabs' like xtabs(~x$P67) It works well and produces something like this: x$P67 - + 779 1318 but i want to compute NA's too, like this: x$P67 - + NA 779 1318 137 I am trying

I hope you could help me with this. I have a dataframe with 5 columns, the first column determining the X values, and the rest four determining four separate Y vectors. How can I plot them on the same graph, overlaying each other? Thanks. Elena Zheleva

Does anyone know a simple way to insert an extra row into a matrix or data frame, thus increasing the dimensions. Wayne KSS Ltd A division of Knowledge Support Systems Group plc Seventh Floor St James''s Buildings 79 Oxford Street Manchester M1 6SS England Company Registration Number 2800886 (Limited) 3449594 (plc) Tel: +44 (0) 161 228 0040 Fax: +44 (0) 161 236 6305