PSYC 212 Lecture Notes - Lecture 5: Receiver Operating Characteristic, Detection Theory, Ovarian Cancer
13 Apr 2018
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Principle 1: sometimes the noise will inc/decrease the subjective perception of the signal eg. square. Sometimes even if there is just noise, it will look like there is a square by chance, the noise will have the same structure as the signal we are looking for. Principle 2: when reporting on your subject experiences, you have to set yourself a criterion for saying yes vs no. Sdt: what is your sensitivity, regardless of your response criterion. Studies used a biomarker made out of antigens (composite score) to test for serous ovarian cancer. Have to make a decision about whether the person has cancer or not. The steps are the ratio of the false alarms vs hits for a given criterion the different thresholds of the biomarker. This helps select the threshold a function of the level of hits vs false alarms that you want to have eg. for diagnostic tests fa are better than misses.
