POPM 3240 Chapter Notes - Chapter chapter 5: Chlamydia Infection, Bulk Tank, Net Present Value
16 Sep 2017
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Cutoff level must be set in order to distinguish normal and abnormal conditions: in either unimodel or bimodel, it is easy to see the extremes and the normals. However, uncertainty remains and falls into the gray zone. Sadly, very few of these tests exist in the real world. The main reasons for this are test imperfections and biological variability. a (top-left), b (top-right), c (bottom-left), and d (bottom-right). +, because they were indicated to have the disease but we know that the gold standard didn"t. put into b cell. This is also a type i error: if they tested positive on gold standard but was negative on the other test, they"re put into cell c and are deemed false negative. We can determine these using a 2 2 table. Sensitivity (sn) is the ability of the test to identify correctly those who have the disease or outcome of interest.
