[R] subsetting a dataframe

[Dimitris Rizopoulos]

try this:

Minus127 <- ShortLavin[!row.names(ShortLavin) %in% "127", ]


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm

----- Original Message ----- 
From: "John Sorkin" <jsorkin at grecc.umaryland.edu>
To: <r-help at r-project.org>
Sent: Tuesday, March 04, 2008 2:41 PM
Subject: [R] subsetting a dataframe


> windows XP
> R 2.6.0
>
> I am having problems deleting a row from a data frame. I create my 
> dataframe by subsetting a larger dataframe:
>
> ShortLavin<-Lavin[Lavin[,"Site"]=="PP" | Lavin[,"Site"]=="CC" | 
> Lavin[,"Site"]=="FH",]
>
> I then perform a glm using the data frame and plot the results.
>
> fit1poisson<-glm(NumUniqOpPt~Seq+Site,family=poisson(link = 
> "log"),data=ShortLavin,offset=log(NumUniqPt))
> plot(fit1poisson)
>
> On the plots I see a point labeled as 127 that is an extreme value. 
> I want to re-run the glm excluding the extreme observation. I have 
> tried several methods to exclude the observation (shown below), none 
> have worked.
>
> Minus127<-ShortLavin[-127,]
> Minus127<-ShortLavin[-"127",]
> Minus127<-ShortLavin[-c(127),]
> Minus127<-ShortLavin[-c("127"),]
>
> None of these worked. Suggestions on how I can remove observation 
> 127 would be appreciated
>
> Thank you,
> John
>
> John Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
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