What is an Interaction?

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*#:Chart 1a below shows an additive effect
*#:Chart 1a below shows an additive effect
*#:Chart 1b below shows an Interaction.*
*#:Chart 1b below shows an Interaction.*
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*# ''Example 2'' - A second example of an interaction is that alone neither variable may have an effect on running speed, such as imagining that an energy bar by itself, or an energy drink by itself, is unable to increase running speed. But, there might be an interaction effect that influences running speed when you eat the bar ''and'' drink the drink, such as the energy bar having a chemical that unleashes the power of the energy drink to increase running speed.  
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*# ''Example 2'' - A second example of an interaction is that alone neither variable may have an effect on running speed, such as imagining that an energy bar by itself, or an energy drink by itself, is unable to increase running speed. But, there might be an interaction effect that influences running speed when you eat the bar ''and'' drink the drink, such as the energy bar having a chemical that ''unleashes'' the power of the energy drink to increase running speed.  
*#:Chart 2a shows when neither variable has an effect, with no Interaction
*#:Chart 2a shows when neither variable has an effect, with no Interaction
*#:Chart 2b also shows when neither variable has an effect, but now with an Interaction
*#:Chart 2b also shows when neither variable has an effect, but now with an Interaction
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<nowiki>*</nowiki>(FYI - there are other graphical representations of Interactions and Main Effects such as effects being reduced (e.g., imagine all the graphs below being flipped down) or effects going in the opposite direction (e.g., imagine all the graphs being flipped to the right), but for simplicity sake they are not displayed because you can discern those graphs after identifying the major types described below).
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<nowiki>*</nowiki>(FYI - Chart 1b shows an ordinal interaction. A disordinal interaction occurs when the two lines cross).
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==Graphical representations of Interactions==
==Graphical representations of Interactions==
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#Main Effect for Variable A
#Main Effect for Variable A
#Main Effect for Variable B
#Main Effect for Variable B
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There are other graphical representations of Interactions and Main Effects such as effects being reduced (e.g., imagine all the graphs below being flipped down) or effects going in the opposite direction (e.g., imagine all the graphs being flipped to the left), but for simplicity sake they are not displayed because you can discern those graphs after identifying the major types described below.
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◄ Back to [[Analyzing Data]] page

Latest revision as of 02:07, 24 November 2010


Contents


Interactions and Main Effects


*(FYI - Chart 1b shows an ordinal interaction. A disordinal interaction occurs when the two lines cross).

Graphical representations of Interactions

This column shows the four possibilities WITHOUT an interaction:

  1. Two Main Effects
  2. No Main Effects
  3. Main Effect for Variable A
  4. Main Effect for Variable B

This column shows the four possibilities WITH an interaction:

  1. Two Main Effects
  2. No Main Effects
  3. Main Effect for Variable A
  4. Main Effect for Variable B

There are other graphical representations of Interactions and Main Effects such as effects being reduced (e.g., imagine all the graphs below being flipped down) or effects going in the opposite direction (e.g., imagine all the graphs being flipped to the left), but for simplicity sake they are not displayed because you can discern those graphs after identifying the major types described below.

NoI2MEc.JPG

I2ME.JPG

NoINoME.JPG

INoME.JPG

NoIMEb.JPG

IMEb.JPG

NoIMEd.JPG

IMEd.JPG



Statistical formula behind Interactions




◄ Back to Analyzing Data page

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