Syed The term "independent variables" is confusing in the context of regression. It does not mean that the variables are independent of one another. It means that they are independent of the error incurred in the estimation. The variance-covariance matrix is classically produced directly from the data and does not need to be diagonal.
The difference between simple kriging and regression is solely that the covariances are derived from a model rather than directly from the data. Isobel http://geoecosse.bizland.com/books.htm
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