ANOVA

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  • Created by: 10dhall
  • Created on: 29-11-17 19:31
What does an ANOVA test?
The variance in the participants between groups and within groups
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What in an ANOVA shows difference/ significance?
If the between pp variance is larger than the within pp variance, significance is shown
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What can we do to find what is causing the ANOVA difference?
Run separate comparisons for each condition comparison or run a t test
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What is an ANOVA?
Parametric test of variance. Used if there are more than 2 conditions/groups.
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What is a one way ANOVA
study with 1 factor but more than 2 conditions
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How is homogeneity of variance assessed in IG ANOVA?
Levennes test - if p>0.05 - equal variance
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What is the F score/ratio?
BG variance/WG variance - the higher the number, the more difference
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What are type 1 and 2 errors?
1= thinking significant result when it wasn't. 2- thinking non significant when it was
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What is familywise error?
The error rate increases due to interaction between different factors and comparisons - can cause type 1 error
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How can we get around this?
Post hoc tests - bonferroni correction
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Whats the bonferroni correction?
divide the acceptable p value by the number of conditions
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What is a factorial designs/ multiway ANOVA?
With more than 2 IV's
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What does factors and levels mean?
factors- IV, levels - conditions/groups
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What can the reason for difference be in FD?
main effects or interactions
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How do you interpret interaction graphs?
If the lines are parallel then theres no interaction, if they aren't parallel then there is an interaction
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What is Maulchlys test of sphericity?
RM - more than 2 conditions, it tells us if the conditions can be compared, should not be significant
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How would you write the main effect?
F(BS df, error df) = F, p=sig, n^2
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What is the pairwise comparison output?
Post hoc test, comparing conditions to each other
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What is a simple effect?
Difference between 2 conditions of a factor in a single condition of another factor
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How would you test simple effects??
Split the file on SPSS! Use a t-test (RM or IG) - use bonferroni/ other - pos hoc
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What is an effect size?
strength of relationship or difference between conditions - partial eta squared - z score = score 1-score 2 divided by mean SD
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Card 2

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What in an ANOVA shows difference/ significance?

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If the between pp variance is larger than the within pp variance, significance is shown

Card 3

Front

What can we do to find what is causing the ANOVA difference?

Back

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Card 4

Front

What is an ANOVA?

Back

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Card 5

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What is a one way ANOVA

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