What is an Interaction?

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Examples



Graphical representations of interactions

►When an energy bar increases running speed, that is called a "Main Effect" (ME) for the energy bar; and when the energy drink also increases running speed, that is a ME for the energy drink. Chart 1 below shows the graphical result when there are two ME but no Interactions.


File:NoI2MEb.JPG

I2ME.JPG



Statistical formula behind interactions

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