Re: [R] arcsine transformation

From: Michael Kubovy <kubovy_at_virginia.edu>
Date: Wed, 30 Apr 2008 17:33:24 -0400

Perhaps you need
with(workingdata, asin(BEFORE))
or
asin(workingdata$BEFORE)



Professor Michael Kubovy
University of Virginia
Department of Psychology
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On Apr 30, 2008, at 4:52 PM, Claire Sheller wrote:

> I have been trying to preform both a bartlett's test and an arcsine
> transformation on some average percentage data. I've tried inputting
> it
> different ways and I keep getting the same error message:
>
>> head(workingdata)
> DYAD BEFORE AFTER
> 1 BG-FL 4.606772 5.787520
> 2 BG-LL 5.467503 7.847395
> 3 AD-MV 5.333735 11.107380
> 4 MM-FL 5.578708 12.063500
> 5 MM-MV 2.037605 6.415303
> 6 MM-RM 6.158885 11.911080
>> bartlett.test(BEFORE ~ AFTER)
> Error in bartlett.test.default(c(4.606772, 5.467503, 5.333735,
> 5.578708, :
> there must be at least 2 observations in each group
>> asin(BEFORE)
> [1] NaN NaN NaN NaN NaN NaN NaN
> Warning message:
> In asin(BEFORE) : NaNs produced
>
> I'm at a loss here and I would greatly appreciate any guidance that
> could be
> given me. Thank you!
>
> --
> Claire Sheller
> Department of Anthropology
> Tulane University
> New Orleans, LA 70118
> 615-210-9129

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