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Anyone can help me?Please~
I have the same problem too.
Before reverse coding, cronbach alpha for 10 items of attitude is 0.764.
But, after I have reversed coding the 5 items of negative statements, cronbach alpha become 0.331.
Dammit, if you are going to write as a Reply to a message from
2009, please have the consciousness to know that WE do not
read via Google-Groups, so WE do not have the text of that message
unless our ISP has saved it. Here:
Error Message: "The value is negative due to a negative average
covariance among items. This violates reliability model assumptions.
You may want to check item codings."
I am trying to run a reliability analysis and the above error
message appears with my results in relation to the cronbach's alpha
if item deleted. I am certain that everything has been reverse
scored, so I can't figure out why this message is appearing. any
0) (Your report of numerical results seems unlikely
to be fully accurate.)
1) I'm surprised if there wasn't an Reply in 2009. Did you look
2) ERROR says you must have some negative correlations.
So, LOOK AT the correlation matrix. Is everything
positive? It is an option in Reliability, or you can just
The popular error is to compute the reversed score
with a new name (good idea) but to feed Reliability
the original set of names. Oops!
Less often, you may have merely screwed up while
trying to reverse the scores. As a check: The
original matrix (with some reversed scores) should
be exactly the same as the corrected matrix, except
for reversed signs whereever only one of the variables
had to be reversed.