[R] Finding cases in one subset that are closet to another subset
Good afternoon Running R2.10.0 on Windows I have a data frame that includes (among much else) a factor (In_2006) and a continuous variable (math_3_4). I would like to find the 2 cases for In_2006 = 0 that are closest to each case where In_2006 = 1. My data looks like In_2006 math_3_4 0 55.1 1 51.6 1 18.1 1 26.6 1 14.1 1 9.6 1 48.9 1 12.9 0 63.0 0 51.8 etc. for several hundred rows. I would like a new data frame that has all the cases where In_2006 = 1, and those cases of In_2006 that are closest to those cases Thanks in advance Peter Peter L. Flom, PhD Statistical Consultant Website: www DOT peterflomconsulting DOT com Writing; http://www.associatedcontent.com/user/582880/peter_flom.html Twitter: @peterflom __ 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.
Re: [R] Finding cases in one subset that are closet to another subset
On 12/2/2009 3:01 PM, Peter Flom wrote: Good afternoon Running R2.10.0 on Windows I have a data frame that includes (among much else) a factor (In_2006) and a continuous variable (math_3_4). I would like to find the 2 cases for In_2006 = 0 that are closest to each case where In_2006 = 1. My data looks like In_2006 math_3_4 0 55.1 1 51.6 1 18.1 1 26.6 1 14.1 1 9.6 1 48.9 1 12.9 0 63.0 0 51.8 etc. for several hundred rows. I would like a new data frame that has all the cases where In_2006 = 1, and those cases of In_2006 that are closest to those cases Hi Peter: How about using one of the various matching packages (MatchIt, optmatch, Matching)? For example, something like this: DF - data.frame(X = rbinom(200, 1, .1), Y = runif(200)) library(MatchIt) DF.match - matchit(X ~ Y, data=DF, method='optimal', ratio=2) DF[c(rownames(DF.match$match.matrix), c(DF.match$match.matrix)),] hope this helps, Chuck Thanks in advance Peter Peter L. Flom, PhD Statistical Consultant Website: www DOT peterflomconsulting DOT com Writing; http://www.associatedcontent.com/user/582880/peter_flom.html Twitter: @peterflom __ 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. -- Chuck Cleland, Ph.D. NDRI, Inc. (www.ndri.org) 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ 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.
Re: [R] Finding cases in one subset that are closet to another subset
On Dec 2, 2009, at 3:01 PM, Peter Flom wrote: Good afternoon Running R2.10.0 on Windows I have a data frame that includes (among much else) a factor (In_2006) and a continuous variable (math_3_4). I would like to find the 2 cases for In_2006 = 0 that are closest to each case where In_2006 = 1. You ask for closest which would imply a singleton, but you also ask for cases (plural). Define closest, please. My data looks like In_2006 math_3_4 0 55.1 1 51.6 1 18.1 1 26.6 1 14.1 1 9.6 1 48.9 1 12.9 0 63.0 0 51.8 etc. for several hundred rows. I would like a new data frame that has all the cases where In_2006 = 1, and those cases of In_2006 that are closest to those cases Thanks in advance Peter Peter L. Flom, PhD Statistical Consultant Website: www DOT peterflomconsulting DOT com Writing; http://www.associatedcontent.com/user/582880/peter_flom.html Twitter: @peterflom __ 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. David Winsemius, MD Heritage Laboratories West Hartford, CT __ 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.
Re: [R] Finding cases in one subset that are closet to another subset
David Winsemius dwinsem...@comcast.net wrote On Dec 2, 2009, at 3:01 PM, Peter Flom wrote: Good afternoon Running R2.10.0 on Windows I have a data frame that includes (among much else) a factor (In_2006) and a continuous variable (math_3_4). I would like to find the 2 cases for In_2006 = 0 that are closest to each case where In_2006 = 1. You ask for closest which would imply a singleton, but you also ask for cases (plural). Define closest, please. I would like the 2 closest cases that is, for each case in one set, the two that are closest in the other set. Sorry if I was not clear Peter Peter L. Flom, PhD Statistical Consultant Website: www DOT peterflomconsulting DOT com Writing; http://www.associatedcontent.com/user/582880/peter_flom.html Twitter: @peterflom __ 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.
Re: [R] Finding cases in one subset that are closet to another subset
Thanks Chuck I did not know about that MatchIt. I will check it out Peter -Original Message- From: Chuck Cleland cclel...@optonline.net Sent: Dec 2, 2009 3:47 PM To: Peter Flom peterflomconsult...@mindspring.com Cc: r help r-help@r-project.org Subject: Re: [R] Finding cases in one subset that are closet to another subset On 12/2/2009 3:01 PM, Peter Flom wrote: Good afternoon Running R2.10.0 on Windows I have a data frame that includes (among much else) a factor (In_2006) and a continuous variable (math_3_4). I would like to find the 2 cases for In_2006 = 0 that are closest to each case where In_2006 = 1. My data looks like In_2006 math_3_4 0 55.1 1 51.6 1 18.1 1 26.6 1 14.1 1 9.6 1 48.9 1 12.9 0 63.0 0 51.8 etc. for several hundred rows. I would like a new data frame that has all the cases where In_2006 = 1, and those cases of In_2006 that are closest to those cases Hi Peter: How about using one of the various matching packages (MatchIt, optmatch, Matching)? For example, something like this: DF - data.frame(X = rbinom(200, 1, .1), Y = runif(200)) library(MatchIt) DF.match - matchit(X ~ Y, data=DF, method='optimal', ratio=2) DF[c(rownames(DF.match$match.matrix), c(DF.match$match.matrix)),] hope this helps, Chuck Thanks in advance Peter Peter L. Flom, PhD Statistical Consultant Website: www DOT peterflomconsulting DOT com Writing; http://www.associatedcontent.com/user/582880/peter_flom.html Twitter: @peterflom __ 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. -- Chuck Cleland, Ph.D. NDRI, Inc. (www.ndri.org) 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 Peter L. Flom, PhD Statistical Consultant Website: www DOT peterflomconsulting DOT com Writing; http://www.associatedcontent.com/user/582880/peter_flom.html Twitter: @peterflom __ 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.
