Term
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Definition
| Data collected at a single point in time; people @ diff. stages |
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Term
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Definition
| Data collected 2 or more times over a long-time |
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Term
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Definition
| Same question, diff people; see patterns over time |
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Term
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Definition
Nurses Health Study, Framingham Study
Same people followed over a long time |
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Term
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Definition
| Correlation design, potential cause in present linked to hypothesized outcome |
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Term
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Definition
Cases are compared to "controls" on potential causes;
lung CA vs w/out lung CA |
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Term
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Definition
| Start in the present and look in the past |
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Term
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Definition
| No intervention, study is observational |
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Term
| Within-Subjects (Time Series) |
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Definition
| One group studied B4 & after; 12hr shift & 8hr shift |
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Term
| Nonequivalent Control Group |
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Definition
Intervention group compared with nonrandomized comparison group;
assign themselves to group 8am vs 6pm class |
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Term
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Definition
| Involves an intervention but lack either randomization or control group. |
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Term
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Definition
| More than one IV is experimentally manipulated; ASA, Codeine> pain |
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Term
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Definition
| Same people compared at different times or under diff conditions |
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Term
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Definition
| Different people are compared; men & women |
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