Dear all,

Suppose I have an aggregation model which is in the following form:
  Y = X11 * X12 + X21 * X22.

This model could be thought as an aggregation of two knowledge, namely 
X1. and X2.. Each knowledge contains two pieces of information 
(attributes). For example, X1 contains X11 ans X12. Now if X.1 is the 
height, and X.2 is the weight of a person. Then, the aggregation of any 
two persons, say, Student1(height=170cm, weight=60kg), 
Student2(height=180cm, weight=68kg) can be represented by

Y = 170*60+180*68=22440.

My question: a model as the above form is linear or interactive? I doubt 
it is not a linear model. Since it is not in this form: Y= c1 X1 + c2 X2, 
where c1 and c2 are constant. I doubt it is not a pure interactive form, 
since X.1 and X.2 are dependent. Sorry for this stupid question.

Wen-Feng


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