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57776
Numerical Stat Tests
Description
Stat Tests Mind Map on Numerical Stat Tests, created by Keith Walker on 26/04/2013.
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stat tests
stat tests
Mind Map by
Keith Walker
, updated more than 1 year ago
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Created by
Keith Walker
about 11 years ago
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Resource summary
Numerical Stat Tests
1 group
1 sample from a frame and 1 variable
Parametric
1 sample t-test
Compares means. H₀: μ = μ₁
example:
Non-Parametric
Wilcoxon signed ranks test
ranks values/differences ignoring signs. H₀; Median difference =0
Example:
2 Groups
Paired
Parametric
Paired t-test
Compare the mean of the diferences between the two measurements. If =0 then two groups the same. H₀; μ of diffs = 0
Example: Recruits with tooth decay at onset and 1 year later. Or Case Control study
Non-parametric
Wilcoxon signed ranks test
Rank the differences, ignoring signs. H₀; differences between -ve and +ve =0
Independent
Parametric
unpaired t-test
compare means of the two samples. H₀: means in both groups equal
Non-Parametric
Wilcoxon rank sum test. Mann Whitney U test
Sum the ranks in the two groups and compare
>2 Groups
Parametric
ANOVA
between group variance (a) should equal within group variance (b) under the Null. ie HOMOSCDASTIC
Therefore H₀: a = b. H₁: a > b
Based on F -Ratio
Non-parametric
Kruskal-Wallis test
Same as Wilcoxon rank sum but take into account sample sizes
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