ANCOVA - Allows us to determine if two or more regression lines are the same

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ANCOVA - Allows us to determine if two or more
regression lines are the same --gt compare
relationship between two continuous variables
across various groups
YM ?0 ? 1XM
HEIGHT
YF ? 0 ? 1XF
AGE
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Important comparisons Are the ? 1s the same
for the two groups? Are the ? 0s the same
for the two groups? Is the common slope 0?
H0 ? 1(females) ? 1(males)
H0 ? 0(females) ? 0(males)
H0 ? 1(males females) 0
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HEIGHT
AGE
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HEIGHT
AGE
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INTERACTION p 0.928, therefore do NOT reject
slope null, the slopes for the groups are the
same.
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PARTNERS p 0.027, therefore, reject intercept
null, the intercepts for the groups are
different. THORAX p lt 0.05, therefore reject
common slope 0 null, there is an effect of
thorax length on longevity.
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