________ limits the ability to interpret differences within the data and may subjectively group results invalidly.
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Note
I remind you of the statement in the syllabus and that we reviewed on day 1 regarding inclusivity and psychological research
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Although not required reading today, heres a reference that discusses assessment of gender and respecting gender diversity in psychological research
Cameron & Stinson (2019)
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Quantitative Variables
any variables where the data represent amounts
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Dichotomization
an item or score that initially had a set of continuous values but was then separated into two possible values
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It is more likely to increase following dichotomization if the results are broadly put together Note
understanding 3.b.i
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Effect size
- generally, what happens to effect size following dichotomization
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Power
- generally, what happens to power following dichotomization
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NOTE
Anecdotally, I still see examples of this quite often)
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Dichotomization limits the ability to interpret differences within the data and may subjectively group results invalidly.
What are the key problems with dichotomization?
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More likely to increase correlation.
Does dichotomization increase or decrease (or both) obtained correlation?
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Decrease
Does dichotomization increase or decrease (or both) effect size?
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Increases in groups, decreases in correlation
Does dichotomization increase or decrease (or both) power?
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It was used before, it simplified analysis, gained capability of examining moderator effects, categorized because of skewed data, using significant cutpoints, and improved statistical power.
How do researchers justify dichotomization?
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When using broad age ranges, or other categorical groups that are similar for the content being tested.
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