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8 Cards in this Set
- Front
- Back
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Density-based sampling (aka incidence density sampling)
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-most common in case-control studies
-controls selected as cases are identified -reflect person-time (matched on person-time?) -some people can appear in a study twice (once as a control, then later as a case) |
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In a cohort study, what is the relationships between the EOR and the DOR?
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EOR = DOR
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In a case-control study, what is the relationship between the EOR and the DOR?
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the EOR approximates the DOR
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What does the DOR approximate when the outcome is rare (<5%)?
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The DOR approximates the RR when the outcome is rare.
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Definition of Cumulative Incidence Sampling (as opposed to Incidence Density Sampling)
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-cases identified as they occur
-controls selected at end of study |
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Definition of a confounder?
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a factor associated with both exposure and outcome that is not on the casual pathway!
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Frequency Matching
(as opposed to Individual Matching) |
controls are selected that that a group of controls has the same frequency distribution of characteristics as a case group
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Nested case-control studies are based on what sampling approach?
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Incidence Density Sampling, or Risk Set Sampling
--> controls are selected at the moment when case occurs --> equivalent of matching cases and controls on duration of follow-up |
