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Topic 03 CLG Slides

Topic 03 CLG Slides - CLG Activity#1 Please discuss...

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CLG Activity #1 Please discuss questions 3.1-3.6 from the handout.
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CLG Activity #1 Q1: Research Questions? Is there an effect of smoking on SBP? Is body size associated to SBP? Can any combination of the three variables be used to predict SBP?
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CLG Activity #1 Q2: The use of the quetelet index as a measure of “size”? This shouldn’t adversely affect the analysis – though if data were available we might want to consider height and/or weight separately. A problem to be aware of is that quetelet index may be correlated with age to some extent. Correlations among predictors can be problematic in a multiple regression analysis.
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CLG Activity #1 Q3: Smoking Status Variable This is what is called an indicator variable . It is perfectly acceptable in regression, but the slope parameter has a different meaning for this type of variable. What is this meaning? The associated slope will be the size of the difference in average blood pressures for smokers when compared to non-smokers.
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