Acknowledgments
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Since the
expected value is dependent on
, each contour line will have a different
slope for various values of
.
In this model
, one can see how the change in expected value as one variable increases also depends heavily on the value of the other variable. This concept is called interaction.
It is important to note
, that if the model
involves variable interaction
,
the understanding of the
cannot be applied since
it is impossible to increase
and hold the remaining variables constant [2].
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same amount
focus will be
actual value
simple case
, each contour line will have a different 
cannot be applied since 
and hold the remaining variables constant [2].