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the "reference". In this example, group 1 was chosen to be the reference group. As such the model to be fit is
:with the constraint that is zero.
:In this model is the mean of the reference group and is the difference from group to the reference group. is not included in the matrix because its difference from the reference group (itself) is necessarily zero.

See also

* Moment matrix
* Projection matrix
* Jacobian matrix and determinant

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