Very well, Bill. all = TRUE seemed to fix the problem.

On Wed, Feb 9, 2011 at 7:54 PM, <Bill.Venables@csiro.au> wrote:

> You want advice?
>
> 1. Write sentences that contain a subject and where appropriate, an object
> as well.  This makes your email just that bit more polite.  This list is not
> a paid service.
>
> 2. The "sheets" may have variables in common, but do they have the same
> name in both, and the same class, and some values in common?
>
> You do not give us very much to go on.
>
> -----Original Message-----
> From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-project.org]
> On Behalf Of Benjamin Caldwell
> Sent: Thursday, 10 February 2011 1:22 PM
> To: r-help
> Subject: [R] merge multiple .csv files
>
> Am trying to merge about 15 .csv tables - tried a test run but came up with
> 0 rows (no data for each variable/column head)
>
> > CAHSEE.EA.feb.2009<-read.csv("2009 CAHSEE EA feb 2009.csv", header=TRUE)
> > CAHSEE.IM.MATH.2009<-read.csv("2009 CAHSEE Impact Math.csv", header=TRUE)
> > testmerge<-merge(CAHSEE.EA.feb.2009,CAHSEE.IM.MATH.2009)
> > testmerge
>  [1] Grade          LocalStudentID MathPassed     MathScaleScore SchoolCode
>
>  [6] LastName       FirstName      ELAPassed      ELAScaleScore
>  MathTestDate
> <0 rows> (or 0-length row.names)
>
> I know several variables are shared in both sheets. Please advise.
>
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>
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>

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