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Q-YIELD™ FAQ

Why doesn't inverting the target give an inverted result?

The easiest way to understand this is to consider an example. Suppose we have a population which is a mixture of class A and class B.

Class A has the property that its value for parameter x is randomly distributed between 0 and 40, and class B has the proerty that is value for parameter x is randomly distributed between 0 and 50.

Let's look at a picture:

 

Remember that we are looking for nuggets which explain part of the target problem, but not necessarily all of it.

If we look at the above data with the target question "class = A", it is clearly possible to identify a sub-group of records with a value of x above 40. However, there is no similarly distinguishable sub-group with the property "class <> A" or "class = B".

Although intuitively it seems that we should be able to get the opposite answer by negating the problem, it actually depends upon the data as to whether this will indeed be the case.

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