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Due
to this lack of dependency on
, the contours of the second-order no-interaction model are still parallel to one another. However,
unlike the first-order model
, the expected value is no
longer linearly dependent on
. Thus, the contours are curves rather than simple straight lines [2].
Figure 4. Second-Order
No-Interaction Model
2.2.4. FIRST-ORDER
PREDICTORS AND INTERACTION
Unlike
the first two models
, the model with first-order predictors and interaction has nonparallel contour lines.
The model is expressed as
.
Look at the dependency when
is increased by one unit.
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same amount
focus will be
actual value
simple case
, the contours of the second-order no-interaction model are still parallel to one another. However, 
. Thus, the contours are curves rather than simple straight lines [2].
.