EPID 301 Chapter 6,7: EPID 301 Week 3 Reading NOTES
1 Oct 2017
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Chapter 6: head or tails the role of chance. Three alternative explanations to epidemiological data: chance (chapter 6, bias or error (chapter 7, confounding (chapter 8) If the p-value (p<0. 05) we can reject the null hypothesis (this indicates that results are not likely from chance: rejecting this hypothesis means that we reject that there is no difference between the means. Use of confidence intervals is usually preferred over p-values: provides more information when looking at data. Chapter 7: all that glitters is not gold the problem of error. Is the divergence, by chance alone, of a measurement from the true value: systematic referred to hen error occur when measurements differ from the truth in a non-random way. How are random and systematic error related: these types are related to selection of participants for the study or comparison, or, related to the measure of exposure and/ or outcome.
