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I am doing a master thesis project and I am comparing(biological variables)between 3 groups (10 each) , under microscope , Do I have to have another observer with me ? or I am enough !
If that ok
I will proceed to do calibration with my supervisor ? but can any one explain to me briefly how it is done or give me a good reference .
after I will be calibrated I will do intra - rater reliability using Kappa ? but my data will be ordinal , so what is your statistical advice regarding the test because I read about "weighted kappa " what do you think ?
Please really I am here because I am in critical situation in my master and I am looking for your valuable advice
Thank you waiting for replies ........
Last edited by matahap; 10-07-2009 at 05:00 PM.
Re: Relibility issues
Weighted Kappa is the appropriate analysis for ordinal data. But there is no such thing of intra-rater reliability. There are two main types of reliability which relevant to experimental study. First, Inter-rater reliability means whether the results from both of you and another rater on the same subject are consistent among each other at one time. Second, test-retest reliability means the same subject is measured from one time to another time to see if the results are consistent at different times. I think you are talking about inter-rater reliability, then you need to find another rater to compare the same sample at the same time for you.
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