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Weights MatricesWe have rook's and queen's rule, and row and column standardized weights matrices. Some can be used in spatial models, others not so much. Some are suitable for two- and even three-W models. Try just one type, or mix and match!
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Idempotent MatricesTry as we might, we just can't seem to produce any result we didn't already have! You'd think that just once, an idempotent matrix would slip up and create something new... no originality whatsoever. Still, these are certainly useful and often simplify when no other approach will do!
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Hessians and JacobiansLike a good utility fielder for the Cubs, you simply can't minimize the value of a good Jacobian! Maximize your value and buy our special Holiday Assortment while supplies last.
Our Hessians would make Ludwig Otto proud! Order with and without borders... -
Identity MatricesId, ego, and super-ego, we are absolutely comfortable with our identities! Stock up on these and never again worry about identity theft!
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Kroenecker ProductsTalk about time-savers! Anyone who has ever had occasion to use Kroeneckers won't want to be caught without them! We sell these by the dozen...
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Leontief InversesScorned by some, loved by others, we have numerous national and a limited supply of regional Leontief inverses. Most are sold open, but some are completely closed! Order yours now!
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Grammian MatricesThese prove exceptionally useful when all other matrices fail. Particularly useful in studies of Brownian motion. Guaranteed to expand matrices up from m x m to (m+n) x (m+n) or, vice versa, reduce them right back down without any loss of information. Have to be seen to be believed but remember they are going fast.
Special Use Matrices
Dummy variablesPropensities
Error terms
Elasticities
Coefficients
Chi-squared
Macro variables
Weights matrices
Idempotent matrices
Eigenvalues and vectors
Hessians and Jacobians
Kroenecker products
Degrees of freedom
Interaction terms
t-statistics
Deltas
R-squared
Multipliers
Identity matrices
Data to support results
Grammian Matrices