On Thursday, July 21, 2011 at 6:46:53 PM UTC+5,
arisai...@yahoo.com wrote:
Hi all! I am using a set of multiple-choice questions in y reaserch.
It has 23 items. Each item has 3-4 answers and only 1 answer is
allowed.
In the SPSS, I have chosen 'scale' as the measure type and enter '0'
for wrong answers and '1' for correct answers. The answers of each participant then have been computed to get the total correct answer.
I have run a reliability test on the 23 items. However, the cronbach
alpha reading was low .591. It also shows a warning as below:
"Warnings
The determinant of the covariance matrix is zero or approximately
zero. Statistics based on its inverse matrix cannot be computed and
they are displayed as system missing values".
What does this mean? Am I entering the data correctly?
Thank you
Aisha
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