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...y more than are presented here so I would really need to be able to loop over the data frame successively to return a final df with my searched values in at least one of the columns. Your help and assistance is much appreciated, Natalie ----- Natalie Van Zuydam PhD Student University of Dundee nvanzuydam at dundee.ac.uk -- View this message in context: http://r.789695.n4.nabble.com/Subsetting-a-data-frame-with-multiple-values-and-exclusions-tp3874967p3874967.html Sent from the R help mailing list archive at Nabble.com.

...to do. In addition to this the vector lengths won't match up as the first date in the sequence won't be subtracted from itself. I'm not sure if anyone knows an easier way to achieve this. Thanks for the help, Natalie ----- Natalie Van Zuydam PhD Student University of Dundee nvanzuydam at dundee.ac.uk -- View this message in context: http://r.789695.n4.nabble.com/within-group-sequential-subtraction-tp3346033p3346033.html Sent from the R help mailing list archive at Nabble.com.

...wer for a meaningful comparison. Is there anyway to compare the same individuals during different exposure times and to look at the effect of different covariates under the exposed and unexposed conditions? Thanks for you help, Natalie ----- Natalie Van Zuydam PhD Student University of Dundee nvanzuydam at dundee.ac.uk -- View this message in context: http://r.789695.n4.nabble.com/Stats-question-Comparison-of-the-same-individuals-during-two-exposure-times-tp4636732.html Sent from the R help mailing list archive at Nabble.com.

...string. How would I incorporate look for terms to include but don't return the row of the data frame if it also includes one of the terms to exclude while using partial matching? I hope that this makes sense. Many thanks, Natalie ----- Natalie Van Zuydam PhD Student University of Dundee nvanzuydam at dundee.ac.uk -- View this message in context: http://r.789695.n4.nabble.com/Subsetting-a-data-frame-tp4160127p4160127.html Sent from the R help mailing list archive at Nabble.com.

Dear R users, I have two data frames that were read from text files as follows: x_data <- read.table("x.txt", header = TRUE, sep = "|", quote = "\"'", dec = ".",as.is = TRUE,na.strings = "NA",colClasses = NA, nrows = 3864284, skip = 0, check.names = TRUE,fill=TRUE, strip.white = TRUE,

Hi there, I think I'm struggling with a fairly simple problem but can't seem to solve it. I have multiple observations for one unique identifier. Ultimately I want to end up with one line per identifier with multiple observations in rows. I'm really stuck any help would be really appreciated. CAO0337134 05/09/95 CAO0337134 27/09/05 CAO0347741 10/10/04 CAO0347741 12/10/04

Hi everyone, I would like to subset a data.frame using partial values. For example I have the following data.frame: PROCHI Main_condition 1234 411 1235 4110 1236 4111 1237 I20 1238 I201 1239 I202 Now let's say that I use the Subset function. Ordinarily I would use it as follows Subset(x, Main_condition=="411"|Main_condition=="4110" etc to get

...ted into a study. I'm not sure how to do this using the Surv() function. I would have a date of an event and then the enrolment date would be after that. How do I put these two dates into the survival function? Thank you, Natalie ----- Natalie Van Zuydam PhD Student University of Dundee nvanzuydam at dundee.ac.uk -- View this message in context: http://r.789695.n4.nabble.com/Cox-s-regression-analysis-with-Left-truncated-data-tp3692114p3692114.html Sent from the R help mailing list archive at Nabble.com.

Hi Everyone, I have the following problem: data <- structure(list(prochi = c("IND1", "IND1", "IND1", "IND2", "IND2", "IND2", "IND2", "IND3", "IND4", "IND5"), date_admission = structure(c(6468, 6470, 7063, 9981, 9983, 14186, 14372, 5129, 9767, 11168), class = "Date")), .Names =

Hi, I have two dataframes that have some common columns. I would like to join them by the common columns prochi and prescribed_date as there are duplicate prochis but they will be made unique by date. I tried doing an inner join but that just duplicated the columns whereas I would like the information from the test_sql_tsf to fill the NAs in the test_sql_psd common columns. require(sqldf)

Dear R help, I have the following data frame: structure(list(prochi = c("ind_1", "ind_1", "ind_1", "ind_1", "ind_1", "ind_1", "ind_1", "ind_1", "ind_1", "ind_1"), date_1st_event = structure(c(14784, 14784, 14784, 14784, 14784, 14784, 14784, 14784, 14784, 14784 ), class = "Date"),

Dear R users, I've installed Rserve for R version 2.11.0 on x64 Windows 7. I've added the Rserve_d and Rserve files to the /bin/ folder where the R.exe is installed in the program files. I have also created an Rserv.cfg file that contains the following text: remote enable auth disable plaintext disable fileio enable when I run "R CMD Rserve_d" from the dos prompt I

Hi, I have a problem with function match. I might not be using it properly? I have two character vectors that contain a unique identifier: gtype_prochi <- ("CAO1524452" "CAO0966182" "CAO9209719" "CAO4436178" "CAO3761898" "CAO3529266" "CAO2427148" "CAO8829776" "CAO2517174" "CAO5371418"

Hi, I've been trying to use the impute2mach function in the GenABEL library. I unfortunately cannot make a working example as when I scale down the files I no longer get an error message. The error message that I get on the full file is: Error in checkSlotAssignment(object, name, value) : assignment of an object of class "NULL" is not valid for slot "data" in an

Hi everyone, I have another fairly simple question. I want to take the earliest of two dates from these two date columns. I've tried converting the dates to numbers and just get a vector full of NA's. I've also tried using the chron function to compare the two and have been unsuccessful. I then tried to use:temp.2 <- as.POSIXct(strptime(temp, '%d/%m/%Y')) where temp is

Dear R users, I have the following data frame: PROCHI date_admission 2 CAO0000713 1999-12-11 4 CAO0000713 1999-10-25 21 CAO0001743 1989-05-04 25 CAO0001743 1996-09-12 26 CAO0001743 1989-05-17 27 CAO0001743 1987-09-17 28 CAO0001743 1987-09-19 29 CAO0001743 1988-01-27 36 CAO0001747 2004-03-21 38 CAO0001747 2004-03-22 39

Hi All, I have a character data.frame that contains character columns and date columns. I've manage to convert some of my character columns to a date format using as.Date(x, format="%m/%d/%y"). An example of one of my dates is PROCHI DtDeath icdcucd date_admission1 date_admission_2 CAO0004563 <NA> <NA> 2005-09-01 <NA> CAO0073505