Given a level one design matrix, and a subsets object, convert into a list of design matrices, each one of which is the design matrix for its own level
Design matrix for level one code
Robin K. S. Hankin
M. C. Kennedy and A. O'Hagan 2000. “Predicting the output from a complex computer code when fast approximations are available” Biometrika, 87(1): pp1-13
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