How Do You Calculate a 2 by 2 Table?

Hannah, what about positive predictive value? That would be six over 13. James, how would you work out the specificity on this table? I get the true negatives divided by the true negatives, 4 positives, so 966 divided by 9, 7, 3. So according to this table, we've got a very poor sensitivity down in the 20%. A very high specificity. An overall accuracy that looks really reassuring 97%. As he said, because there were so many negative patients and so many negative tests, any calculation that involves this bottom right hand cell, all the true negatives is going to give you a good number.

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