Combining Matrix
Create a combining matrix
combMat(K, l1, l2)
K |
The original number of classes: the matrix will define a combining from K to (K-1) classes. |
l1 |
Label of one of the two classes to be combined. |
l2 |
Label of the other class to be combined. |
If z is a vector (length K) whose kth entry is the probability that an observation belongs to the kth class in a K-classes classification, then combiM %*% z is the vector (length K-1) whose kth entry is the probability that the observation belongs to the kth class in the K-1-classes classification obtained by merging classes l1 and l2 in the initial classification.
J.-P. Baudry, A. E. Raftery, L. Scrucca
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