February 5 - February 5 2013 ADM 2304n Statistical methods...

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February 5, 2013 ADM 2304n
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Non-normal and ordinal data Ø Statistical methods based on ranks
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Leaving Normal Ø Continuous data with non-normal shape Ø Ordinal data
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Continuous
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These are not normal
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When to use non-parametric test Ø Data are ordinal Ø Data are skewed (at least one sample) Ø Some extreme values Ø In general, if concerned that conditions for the t-test do not apply
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Likert scale and Likert item Ø A Likert scale is used to rank people’s responses. A likert item is often scaled on a 5 point scale. § Strongly agree § Agree § Neither agree nor disagree § Disagree § Strongly disagree
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Binned data Ø State your age: [15,24] [25-34] [35,44] [45.55] Over 55 Instead of quoting exact age, respondents choose one of a set of ordered categories.
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Wilcoxon 2 sample test Ø Also known as the Mann-Whitney U Test
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The setup Ø 2 independent samples, X and Y Ø Null: X and Y come from the same distribution Ø Alternate: They differ by a shift of location.
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