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What (who) is reduced model - definition

IN STATISTICS, AN EQUATION WHICH RELATES THE ENDOGENOUS VARIABLE X TO ALL THE AVAILABLE EXOGENOUS VARIABLES, BOTH THOSE INCLUDED IN THE REGRESSION OF INTEREST (W) AND THE INSTRUMENTS

Reduced form model

Model order reduction

Draft:Model Order Reduction; Model Order Reduction; Reduced order model

Model order reduction (MOR) is a technique for reducing the computational complexity of mathematical models in numerical simulations. As such it is closely related to the concept of metamodeling, with applications in all areas of mathematical modelling.

https://en.wikipedia.org/wiki/Model_order_reduction

Reduced form

In statistics, and particularly in econometrics, the reduced form of a system of equations is the result of solving the system for the endogenous variables. This gives the latter as functions of the exogenous variables, if any.

https://en.wikipedia.org/wiki/Reduced_form

Reduced Instruction Set Computer

PROCESSOR EXECUTING ONE INSTRUCTION IN MINIMAL CLOCK CYCLES

Reduced Instruction Set Computer; RISC processor; Reduced Instruction Set Code; Reduced Instruction Set Computing; RISC; RISC-based; RISC-based system; RISC System/6000 SP; Reduced instruction set; RISC architectures; RISC instruction set; RISC-based computer design approach; RISC principles; Reduced instruction set computing

<processor> (RISC) A processor whose design is based on the rapid execution of a sequence of simple instructions rather than on the provision of a large variety of complex instructions (as in a Complex Instruction Set Computer). Features which are generally found in RISC designs are uniform instruction encoding (e.g. the op-code is always in the same bit positions in each instruction which is always one word long), which allows faster decoding; a homogenous {register set}, allowing any register to be used in any context and simplifying compiler design; and simple addressing modes with more complex modes replaced by sequences of simple arithmetic instructions. Examples of (more or less) RISC processors are the {Berkeley RISC}, HP-PA, Clipper, i960, AMD 29000, MIPS R2000 and DEC Alpha. IBM's first RISC computer was the RT/PC (IBM 801), they now produce the RISC-based {RISC System/6000} and SP/2 lines. Despite Apple Computer's bogus claims for their PowerPC-based Macintoshes, the first RISC processor used in a personal computer was the Advanced RISC Machine (ARM) used in the Acorn Archimedes. (1997-06-03)

Wikipedia

Reduced form

In statistics, and particularly in econometrics, the reduced form of a system of equations is the result of solving the system for the endogenous variables. This gives the latter as functions of the exogenous variables, if any. In econometrics, the equations of a structural form model are estimated in their theoretically given form, while an alternative approach to estimation is to first solve the theoretical equations for the endogenous variables to obtain reduced form equations, and then to estimate the reduced form equations.

Let Y be the vector of the variables to be explained (endogeneous variables) by a statistical model and X be the vector of explanatory (exogeneous) variables. In addition let $\varepsilon$ be a vector of error terms. Then the general expression of a structural form is $f(Y,X,\varepsilon )=0$ , where f is a function, possibly from vectors to vectors in the case of a multiple-equation model. The reduced form of this model is given by $Y=g(X,\varepsilon )$ , with g a function.

https://en.wikipedia.org/wiki/Reduced form