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Cards In This Set
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What does standard error of the mean actually mean?
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An estimate of the spread (standard deviation) of sample means around the true population mean
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Arithmetic mean vs geometric mean
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Arithmetic mean = what u know as mean, geometric is square root of the combined product of the values, geometric mean more appropriate in skewed distributions
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What does relative risk mean?
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A way of expressing whether you're more or less likely to have an outcome e.g. disease if you are or are not exposed to a factor e.g. smoking. Relative risk of 1 means there is no difference in disease outcome. More than one means that exposure to the factor increases the risk of disease, and less than one the opposite.
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What does odds mean?
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An expression of having X divided by not having X. The resulting number is not intuitive like relative risk
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What is the odds ratio?
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The ratio of odds of having the disease with exposure divided by the odds of having the disease without exposure. OR>1 means positive association, <1 means negative association
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Meaning of sensitivity:
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No. of positive test results that actually have disease/total no that actually have disease
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Meaning of specificity
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No of correctly identified negative results/total no that are actually healthy
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Positive predictive value
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No. of correctly identified positives/total number with a positive outcome
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Negative predictive value
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No. of correctly identified negatives/total number with a negative outcome
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