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DrKkhan

covariance statistical tests

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What is the difference between ANCOVA, MANCOVA and simple linear and multiple regression as all are to check covariance depending on the number of independent variables but then for the sake of EMI or mcqs, how to differentiate as to which one to choose??

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What is the difference between ANCOVA, MANCOVA and simple linear and multiple regression as all are to check covariance depending on the number of independent variables but then for the sake of EMI or mcqs, how to differentiate as to which one to choose??

Relationships

ANOVA

• tests the significance of group differences between two or more groups

• the IV has two or more categories

• only determines that there is a difference between groups, but doesn’t tell which is

different

ex: Do SAT scores differ for low-, middle-, and high-income students?

ANCOVA

• same as ANOVA, but adds control of one or more covariates that may influence the DV

ex: Do SAT scores differ for low-, middle-, and high-income students after controlling for

single/dual parenting?

MANOVA

• same as ANOVA, but you can study two or more related DVs while controlling for the

correlation between the DV

• if the DVs are not correlated, then separate ANOVAs are appropriate

ex: Does ethnicity affect reading achievement, math achievement, and overall scholastic

achievement among 6

th graders?

MANCOVA

• same as MANOVA, but adds control of one or more covariates that may influence the

DV

ex: Does ethnicity affect reading achievement, math achievement, and overall scholastic

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brilliant :) now next question,

how to differentiate between effect modifier and confounder?

what i understand is that effect modifier is only associated with outcome and not exposure but confounder is associated with both independently.......correct??

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ok strike above question, got it now :)

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