similar to: problem with cbind

Hi All, I have about one hundred patients and all the patients had their glucose measured on three different days. The days are all the same for all he patients. So I have three measurement for each patient . I want to know whether the day when the glucose was measured has an effect on the measurements. I was thinking to use a single factor analysis of variance but I am not sure how to do it in

Hi , Does any one know how to split a character vector , I have a vector X that looks like this and each row has 3 characters X ASK DGH ASG AUJ FRT I would like to split the vector into 3 vectors that look like this X1 X2 X3 A S K D G H A S G A U J U R T thanks -- View this message in context: http://www.nabble.com/How-to-split-a-character-vector-into-3-vectors-tp21939492p21939492.html

My question is related to plot( ) in the mgcv package. Before modelling the data, a few predictors were transformed to normalize them. Therefore, the x-axes in the plots show transformed predictor values. How do I back-transform the predictors so that the plots are easier to interpret? Thanks in advance, Suzan -- Suzan Pool Oregon State University Cooperative Institute for Marine

I would like to merge ?data1 ?that contains 100 unique ID?s with another data set ?data 2? with 150 ID?s and the age of those individuals ( the ID in data1 is a subset of the ID in data 2) I would like to merge these data1 with data2 and have the result of the merge to have the ID ordered as in data1. Can this be done in R? -- View this message in context:

I have a problem with ifelse(), I do not understand how it works. > X<-c(2,2,1,1,0,0) > str(X) num [1:6] 2 2 1 1 0 0 > Y<-ifelse(X>0,1,0) > Y [1] 1 1 1 1 0 0 > Can some one explain what is going on, I do not understand what ifelse is doing in this case. Can someone explain the output Y. Thanks -- View this message in context:

Hi All, I always have a problem with write.csv when I want the column names to be ignored, when I specify col.names=F, I get a header of V1 V2 V3 V4 etc. for example I tried write.csv(mydata, file="data.csv", quote=FALSE, row.names=F, col.names=F) Warning message: In write.csv(mydata, file = "data.csv", quote = FALSE, : attempt to set 'col.names' ignored >

Hi All, I have a character vector with naems of cities in the us. I need to extract the number that appear after the word "New York", for example, x<-c("P Los Angeles44AZ", "P New York722AZ", "K New York20") I want the results to be 722, 20 cab I use the grep function, if so how? I appreciate your help, thanks, -- View this message in context:

Hi All, I was wondering if there is anything that breaks a loop in R. For example, For (k in 1:100) For ( i in 1:10){ If ( condition ){ Break the inner loop } } } In the above case, if the program runs the if statement, then I want the inner loop for (i in 1:10) to stop looping and skip the rest of the program. Thanks for your help -- View this message in context:

Hi All, I was wodering if it is possible to increase the precision using R. I ran the script below in R and MAPLE and I got different results when k is large. Any idea how to fix this problem? thanks for your help for (k in 0:2000){ s=0 for(i in 0:k){ s=s+((-1)^i)*3456*(1+i*1/2000)^3000 } } -- View this message in context:

Hi All, I have a dataset that I would like to split based on : or ? ( the data file is tab delimited) for example: Ny:23-45 AC BA:88-91 DB KJ:21-13 PA And I would like the data to be splitted and the final results look like NY 23 45 AC BA 88 91 DB KJ 21 13 PA I would like to have the resulting data as a data frame so each column is a variable. Thanks, -- View this message in context:

Dear list, I would like to format the result of the 'cut' function to perform a subsequent frequency distribution table (fdt) suitable for publications. Below an reproducible example: set.seed(1) x <- c(rnorm(1e3, mean=10, sd=1), 50, 100) start <- 0 end <- 110 h <-10 c1 <- cut(x, br=seq(start, end, h), right=TRUE) levels(c1) # I get: # [1] "(0,10]"

Hi All, I have a column that contains values between 0 and 1. I would like to make a table that consists of the number of elements in each category. For example , how many elements have values between 0 and 0.1, 0.1 to 0.2, 0.2 to 0.3,etc??..0.9 to 1. Is there an easy way to do this? Thanks -- View this message in context:

Hi All, I am looking into merging 3 data sets I know how to do that by merging data1 with data2 and then merging the result with data 3. I was wondering if it can be done all at once so I tried, M<-merge(data1,data2,data3, by=?ID?) It does not work! Any ideas? -- View this message in context: http://www.nabble.com/merging-3-data-sets-at-once-tp17658873p17658873.html Sent from the R help

Hi, I am new to R an dI need some help I have a matrix of real values 100*300 and I would like to calculate the mean for each column , then for each entry in a column i need to subtract the mean so I will have a matrix where the columns have zero mean. any one know how to do that . Thanks -- View this message in context:

I do have some data of dim 100*3 (i.e 100 rows and 3 columns ) stored in a txt file. I want to read the data into R, Perform the same operation in each row and store the result in a forth column( that I should create). I do not know how I can create a forth column to store the result of the operation for each row? -- View this message in context:

Hi, I do have a data set with some missing values that appear as blanks. I want to fill these blanks with an NA. How can this be done? Thanks for your help -- View this message in context: http://www.nabble.com/filling-blanks-with-NA-tp21584278p21584278.html Sent from the R help mailing list archive at Nabble.com.

Hi All, I have a character vector of length=700. The vector contains names and I want to extract the names that contain the number 101. The number 101 could be anywhere within the name. what is the best way to do this? -- View this message in context: http://www.nabble.com/How-to-extract-names-from-a-vector-tp25773482p25773482.html Sent from the R help mailing list archive at Nabble.com.

I am looping over a data set and at each loop I am creating a dataframe ?mydata? That I wanted to be saves in a .csv file, but I want all the results to be saved in the same file and this is the way I do it write.csv(mydata, file= ?data.csv?=F, append=T) . the csv file looks fine but I always get the following warning message Warning messages: 1: In write.table(mydata, file =?data.csv?, ... :

Hi all I have a data set with the total number of columns =ncol, and the total number of rows=nrow. I am trying to loop over the values and id the value is less than or equal to 100 to be changed to 1. if the value is greater than 100 , to be changed to 0. if NA , let X[i,j]=NA. I ran into a problem where if one row in my data set had all values =NA, then the program does not continue working

I want to know how accurate are the p-values when you do linear regression in R? I was looking at the variable x3 and the t=10.843 and the corresponding p-value=2e-16 which is the same p-value for the intercept where the t-value for the intercept is 48.402. I tried to calculate the p-value in R and I got 0 x<-2*(1-pt(10.843,2838)) > x [1] 0 > G<-lm(y~x1+x2+x3+x4+x5) >