search for: zuydam

...ger and the number of search terms is many 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.

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 =

...#39;m not sure if it does what I need it 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.

...nexposed group is very small and lacks power 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.

...e instead of just at the beginning of the 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,

...e occurred before individuals were recruited 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.