ANOVA - the amount of variation and how it's split "between groups" and "within
groups" is important for ANOVA calculation. How is the total variation represented?
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- the total variation is represented by SStotal (SS = sum of
squares)
- total SS = between groups SS + within groups (error) SS
- each SS has different df
If samples are not independent they are considered to be ____?
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, If samples are not independent they are considered to be paired
- before and after
- left and right arm/eyes/ears
sometimes not straightforward to determine if data are paired
Another example of finding the degree of freedom for a table
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Variation within data can be thought of as having 2 parts: ____ & _____?
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1) variation due to differences between the groups of interest
2) natural (unexplained or random) variation within each group
X2 test gives us guidance as to whether an association observed in a sample is
__________?
X2 test tells us nothing about _________?
, Give this one a try later!
X2 test gives us guidance as to whether an association observed in a
sample is consistent with sampling variation or not
X2 test tells us nothing about magnitude or direction of association
Comparing 2 categorical variables:
If there is no difference between groups relative risk and odds ratio should be equal
to ____?
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If there is no difference between groups relative risk and odds ratio should
be equal to 1
Explain what the chi-squared goodness-of-fit test is?
Give this one a try later!
- statistical test used to quantify the discrepancy between the expected (fe)
and observed (f0) frequencies
What is the process for performing a two-sample t-test?
Give this one a try later!
groups" is important for ANOVA calculation. How is the total variation represented?
Give this one a try later!
- the total variation is represented by SStotal (SS = sum of
squares)
- total SS = between groups SS + within groups (error) SS
- each SS has different df
If samples are not independent they are considered to be ____?
Give this one a try later!
, If samples are not independent they are considered to be paired
- before and after
- left and right arm/eyes/ears
sometimes not straightforward to determine if data are paired
Another example of finding the degree of freedom for a table
Give this one a try later!
Variation within data can be thought of as having 2 parts: ____ & _____?
Give this one a try later!
1) variation due to differences between the groups of interest
2) natural (unexplained or random) variation within each group
X2 test gives us guidance as to whether an association observed in a sample is
__________?
X2 test tells us nothing about _________?
, Give this one a try later!
X2 test gives us guidance as to whether an association observed in a
sample is consistent with sampling variation or not
X2 test tells us nothing about magnitude or direction of association
Comparing 2 categorical variables:
If there is no difference between groups relative risk and odds ratio should be equal
to ____?
Give this one a try later!
If there is no difference between groups relative risk and odds ratio should
be equal to 1
Explain what the chi-squared goodness-of-fit test is?
Give this one a try later!
- statistical test used to quantify the discrepancy between the expected (fe)
and observed (f0) frequencies
What is the process for performing a two-sample t-test?
Give this one a try later!
