On 4/30/2008 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
bartlett.test() expects the second argument to be "a vector or factor
object giving the group for the corresponding elements of x". You seem
to have paired samples instead.
asin(BEFORE)
[1] NaN NaN NaN NaN NaN NaN NaN
Warning message:
In asin(BEFORE) : NaNs produced
You might divide the values by 100 prior to asin().
I'm at a loss here and I would greatly appreciate any guidance that could be
given me. Thank you!
--
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
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