Mark R Laflamme, MD <mlaflamme <at> regenstrief.org> writes: : : Greetings from an R newbie : : Table imported with 4 columns containing Dates and Times, I desire to : determine the differences between said columns : Have loaded the base and chron packages for R commander. Have tried to : use format but without success. Have tried the Postix commands but : error states "unused argument (s) (...)", even though some of the : examples do not use (...) at the end of the command : : Example: : Table is named GvY1 : Operation.Time.End Operation.Time.Dictated : Operation.Time.Verfiy : 7/10/2004 10:10:12 7/12/2004 9:18:03 : 7/28/2004 05:00:02 : : Information is mm/dd/year hh:mm:ss (time of day, e.g. the first column : is July 10th 2004 10:10 AM at 12 seconds) : What is the best way to get the difference between any of the 2 columns? : And eventually test statistics on the columns (eg. P values, if needed, : but not a priority at this time) : Thanks in advance : : Platform WinXP : IBM T40p : R v 1.8.1 : R commander :
Often problems with data frames are due to storing the data as factors rather than in a datetime class but without a reproduceable example its impossible to know for sure. You might be able to solve this yourself by reading the article on dates and times in R News 4/1. ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
