[R] Merging two dataframes
dfolkins at gmail.com
Fri Jun 6 16:55:53 CEST 2008
cool. :) yea, the argument names are by.x and by.y, so your by.etc were
ignored in the black hole of "arguments passed to other methods"
on 06/06/2008 09:11 AM Michael Pearmain said the following:
> Works perfectly.
> Was the problem due to me putting by.survey and by.etc rather than by.y
> and by.x?
> I think when i was playing around i tried the all. command in that setup
> as well
> On Fri, Jun 6, 2008 at 2:07 PM, Daniel Folkinshteyn <dfolkins at gmail.com
> <mailto:dfolkins at gmail.com>> wrote:
> try this:
> FullData <- merge(ETC, SURVEY, by.x = "ord", by.y = "uid", all.x =
> T, all.y = F)
> on 06/06/2008 07:30 AM Michael Pearmain said the following:
> Hi All,
> Newbie question for you all but i have been looking at the
> archieves and the
> help dtuff to get a rough idea of what i want to do
> I would like to merge two dataframes together based on a keyed
> variable in
> one dataframe linking to the other dataframe. Only some of the
> cases will
> match but i would like to keep the others as well.
> My dataframes have 67 and 28 cases respectively and i would like
> ot end uip
> with one file 67 cases long (all 28 are matched cases).
> I can use the merge command to merge two datasets together this
> but i still
> get some
> odd results, i'm using the code below;
> ETC <- read.csv(file="CSV_Data2.csv",head=TRUE,sep=",")
> 'SURVEY <- read.csv(file="survey.csv",head=TRUE,sep=",")
> 'FullData <- merge(ETC, SURVEY, by.SURVEY = "uid", by.ETC = "ord")
> The merged file seems to have 1800 cases while the ETC data file
> has 67 and the SURVEY file only has 28. (Reading the help it
> looks as if it
> merges 1 case with all cases in the other file, which is not
> what i want)
> The matching variables fields are the 'ord' field and the 'uid'
> Can anyone advise please?
> Michael Pearmain
> Senior Statistical Analyst
> 1st Floor, 180 Great Portland St. London W1W 5QZ
> t +44 (0) 2032191684
> mpearmain at google.com <mailto:mpearmain at google.com>
> mpearmain at doubleclick.com <mailto:mpearmain at doubleclick.com>
> Doubleclick is a part of the Google group of companies
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