Hello Allstat
To compare two regression lines produced from two data sets, from spitting a
Data set into two categories, you just need to test B2 in the regression
line:
Y=B0 + B1 (X) + B2 (D)
where:
D is a categorical variable with dummy coding applied to the whole Data
(merging both data sets)
Hence, there is no need to test the interaction unless you want to lower the
value of "alpha" for the test
Is this true ?????????????????????
Dr Aljumaah
Saudia Arabia
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