Hi John, That must be in Canada, where everyone is a thug, unlike here in the US. :-)
But seriously, you make a good point. I guess it depends on what the event variable is: commission of a new crime, start of a new sentence, reincarceration after a period of freedom, etc. (and what data Bob has). If a person is found guilty of two crimes (e.g. two robberies in a single spree) and the jail terms are to be served consecutively, is that one event or two? Chris -----Original Message----- From: John Kane [mailto:jrkrid...@inbox.com] Sent: Wednesday, June 11, 2014 9:13 AM To: Andrews, Chris; Bob Green Cc: r-help@r-project.org Subject: Re: [R] Recurrent analysis survival analysis data format question Hi Chris, Why would you not consider the person at risk for re incarceration if he is currently imprisoned? Symantically I'd agree, he or she is already behind bars. But from the point of view of extra sentences it is quite possible to commit an offence while in prision and recieve another sequential sentence. We have a current case here where three people, already incarcerated, are just been charged with attempted murder. John Kane Kingston ON Canada > -----Original Message----- > From: chri...@med.umich.edu > Sent: Tue, 10 Jun 2014 19:02:30 +0000 > To: bgr...@dyson.brisnet.org.au > Subject: Re: [R] Recurrent analysis survival analysis data format > question > > I wouldn't consider the person at risk for re incarceration if he is > currently imprisoned. So I wouldn't use those intervals as part of the > response variable. Perhaps time in custody would be a covariate used to > model the time until re incarceration. One variable that is commonly > needed for analysis of recurrent data is the number of previous events. > It can be used to, e.g., stratify. > > Chris > > > -----Original Message----- > From: Bob Green [mailto:bgr...@dyson.brisnet.org.au] > Sent: Tuesday, June 10, 2014 2:32 AM > To: r-help@r-project.org > Subject: [R] Recurrent analysis survival analysis data format question > > Hello, > > I'm hoping for advice regarding how to set up a recurrent event > survival analysis data file. My data consists of people released from > custody, with survival time being measured as days before re > imprisonment or end of the study. In the example below, id 5155 is > released 5 times and jailed five times. All events are therefore > true. Daysfree is the difference in days between release and return > to custody. Id 7155 is released 3 times and only re-imprisoned > twice, so the third event value is false. > > id <- c(5155, 5155,5155,5155, 7155, 7155,7155) > Release <- c("29/10/10","9/01/11", "25/03/12", "15/10/13", "9/01/10", > "16/12/12","29/10/13") > JailNew <- c("1/12/10","01/12/11", "27/09/12", "24/01/14", > "22/09/12","24/01/12","24/01/14") > DaysFree <- c(24,234,134,74,709,29,64) > Event <- c("true", "true", "true", "true", "true", "true", "false" ) > DF1<- data.frame(id, Release, JailNew, DaysFree, Event) > DF1 > > After speaking to a statistician today I'm not sure if I my method > of formatting the data is correct. Should all time intervals be > included, not just the period from release to event/end of study > period. Currently period imprisoned is not counted. For example, > for id 5155, would I also include 1/12/10 - 9/01/11 etc, which would > be FALSE for event and have a duration of 39 days; and then include > all the other similar intervals as well. The statistican thought > including this additional information more closely resembled the > bladder1 data in the Survival package. > > Any assistance is appreciated, > > Regards > > Bob > > > ********************************************************** > Electronic Mail is not secure, may not be read every day, and should not > be used for urgent or sensitive issues > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ____________________________________________________________ Publish your photos in seconds for FREE TRY IM TOOLPACK at http://www.imtoolpack.com/default.aspx?rc=if4 ********************************************************** Electronic Mail is not secure, may not be read every day, and should not be used for urgent or sensitive issues ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
