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Relegating - The GDP Structural Modelling Strategy, The Dynamics in Time-Series Data: Short-Run Shocks, Disequilibrium Shocks and Innovative Shocks to Nuisance

Vîntu, Denis (2020): Relegating - The GDP Structural Modelling Strategy, The Dynamics in Time-Series Data: Short-Run Shocks, Disequilibrium Shocks and Innovative Shocks to Nuisance. Published in: International Scientific Conference "Economic and Social Implications of the COVID-19 Pandemic: Analysis, Forecasts and Consequences Mitigation Strategies". , Vol. I, No. 2020 (23 October 2020): pp. 51-53.

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We argue that many confusions relating to the system of methods used in a particular area of study economics and econometrics, if we a considering in time-series forecasting might be considered as arising out of ambivalence or inconclusiveness about the error terms. Relationships between macroeconomic time series are fallacious and, inevitably, the early sentimental frocks-and-romance brigade econometricians concluded that any estimated regression equation, in statistics, an equation constructed to model the relationship between dependent and independent variables would only fit with errors. Beyond dispute, Slutsky concluded that these errors could be interpreted as shocks that constitute wherefore, force behind business cycles. On the other hand, Frisch adjudecated to dissect the errors further into two categories: stimuli, which are analogous to shocks, and irregularity. However, the theory is constraint of providing a statistical framework. Furthermore, Haavelmo interpreted the error term in equations as giving, rather the statistical groundwork for econometric models and making sense that they match up to a priori dispersal assumptions specified in structural models of the stochastic dynamic general equilibrium type, later in 80ths known as simultaneous-equations models intro SDGE approach (proposed in 1982 by Kydland & Prescott.) Because in those days economies required an interpretation in a framework with rather static theoretical models , forming part of the structure of a building simultaneous-equations relegated the dynamics in time-series data frequently to frustration. Relauch of errors interpretation as the shocks in theoretical models came from model-consistent expectations, in that agents inside the model are assumed to "know the model" and on average take the model's predictions as valid. Forecasting of any non-stationary time-series as in our paper are intended to develop vector autoregression modeling giving freshness to the decade in which economic science and econometrics will be put to the test and obstacles. The so-called Sargent, Hansen, and Tallarini’s risk-sensitive permanent income model, and one and two-country stochastic growth models, decomposes the dynamics of the modeled variable into three parts: short-run shocks, disequilibrium shocks, and innovative residuals, with only the first two of these sustaining an economic interpretation.

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