Reliability and validity of diagnosis

IB Psychology: Reliability and validity of diagnosis

Reliability and validity are two very important factors when discussing the process of diagnosis. It is important that we have a clear definition of each term.When preparing this learning objective for the exam, it is important to be able to link each piece of research directly to the term. So, when looking at research on reliability, it should clearly demonstrate the consistency of diagnosis. When looking at validity,...

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Comments 4

Sara Veerman 11 October 2017 - 07:58

Hi John, I wonder how the follow-up study of Rosenhan (identifying pseudo-patients) demonstrates also the concept of reliability. Has it something to do with the differences between psychiatrists and staff members, in labeling people as being healthy/fake?

John Crane 11 October 2017 - 11:48

You are correct, Sara. It really is just validity. I will update the page.

Sarah Jones 15 February 2018 - 01:10

Can you say that the first study shows some reliability as all the pseudo patients were diagnosed in the same way except for 1?

John Crane 15 February 2018 - 05:16

Dear Sarah,

In order for it to be reliability, a patient would need to be diagnosed by more than one professional and get the same diagnosis. This is not the case in the study.

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