week4. extended ANOVA topics Flashcards
what test do you do to work out a simple effect of a ANOVA
a t-test
why do we work out a simple effect
so we can see the relationships between the individual variables
what is a Bonferroni test
it is a multiple-comparison correction used when several dependent or independent statistical tests are being performed simultaneously.
what are post hoc tests
they’re test chosen after the data is published to analyse different parts of the data in more detail
what are priori or planned comparisons
this is when a researched plans extra tests they’re going to do before collecting the data, simple effect etc.
what is undisclosed research flexibility
this is when the data is untrustworthy due to the researcher planning post data collection, trying to find desired result, or type 1 error is possible because of extra, unplanned tests have been done
do Bonferroni tests reduce the instance of a false positive
yes
what is a effect size
it indicates the magnitude of a difference separate from sample
what kind analysis does effect size help with
meta-analysis (cross-study comparison)
what is meta analysis
its a statistical process that combines the data of multiple studies to find common results and to identify overall trends
what is cohen’s d
its a statistical test that measures the difference between two group means
how do you work out the effect size of a t-test
cohen’s d
how do you work out effect size for a ANOVA on SPSS
you select the option “esteems of effect size” and then look at the column called “Partial eta squared” on ANOVA summary table
what is the symbol for effect size for ANOVA
np2
what re the different sizes of effect size for an ANOVA
small =0.01, med = 0.06, large = 0.14
