to done some statistical problems arond income,consumption
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because your econometrics professor said so!
Error terms occur because ofExcluding independent variables from the modelUncertainty in human behaviorSelecting the wrong mathematical formworkConsolidation incorrectnessesClustering errors
i think its pretty much the same thing because matrix X1 X2 IS ACTUALLY X1 X2
Some of the sub-branches of economics that rely on fields of statistics and mathematics are econometrics, transport economics, managerial economics and international economics.
Laplace' is known for transformations in math; as in a Laplace Transformation. Transformations are used extensively in matrix models in general equilibrium theory and econometrics such as Dominate Diagonal transforms. That is where I reached my level of incompetency; fond memories. See: Lionel McKinsey, Economic Theory and Matrices with Dominate Diagonals