BIOL2300 Lecture Notes - Lecture 4: False Positives And False Negatives, Venn Diagram, Sample Space
31 Jan 2017
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Document Summary
Omega: set of outcomes of random experiment. Hh, ht, th, tt: set of 2 consecutive coin flips. P(a) denotes prob of event a, approx by relative frequency. 1,3,5: set of odd numbered outcomes of die roll. A,g: purines in i-th position of nucleotide sequence. Limit of n approaches infinity, relative frequency of occurrence of event a = Prob of heads approximated by # of heads/1000. Each simple event has equal probability (uniform distribution), probability p(a) # sample events in a/size of sample space. Sample space omega: universe: domain of discourse. Conditional probability: p(a|b): probability of a given that b has occurred. True positive: test correctly indicates that conditon is present when its really present. True negative: negative and is really negative. False positive: test positive when actually condition not present. False negative: test negative when actually condition is present. Probability that predicted positive is true positive. Accuracy: probability that test result is correct diagnosis.
