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research1 and II - Epidemiological research Study of the...

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10/4/11 Epidemiological research Study of the frequency, distribution, and causes of disease in a population.
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10/4/11 Cross-Sectional Design Comparisons of a population at one time. Prevalence All individuals with a disease Relative Risk: Risk compared to others.
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10/4/11
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Education Level & Insomnia N = 575
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10/4/11 Research by Correlation Relationship between 2 or more variables Nature and Strength of Association Positive and Negative ranging from –1.0 to 0 to +1.0
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10/4/11 Depression and Insomnia Correlation r = . 45
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10/4/11 Scatter Plots of Data with Various Correlation Y X Y X Y X Y X Y X r = -1 r = -.6 r = 0 r = +.3 r = +1 Y X r = 0 Depres sion Insomni a
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10/4/11 Research by Correlation Correlation vs. causation Third Variable What causes what? Why do we do this?
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10/4/11 Anxiety and Insomnia Correlation R = .44
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10/4/11 SES level and TV watching
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10/4/11 Prospective Design Individuals are followed over time Pros: Notice Time Difference Ex. Depression & Heart Disease Neg: Expensive, Follow Up, third
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