Construction of an explanatory model, Managerial Economics

Assignment Help:

Q. Construction of an explanatory model?

Construction of a sample:  To apply multiple regression a large sample is generally essential (ideally between 2,000 to 15,000 individuals).

Note that for time series data, much less is required.

Data collection: Reliable data should be collected, either from a monitoring system or from a questionnaire survey or from a combination of both.

Calculation of coefficients:  Coefficients can be calculated comparatively easily, by using statistical software which is both accessible and affordable to PC users.

Test of the model:  The model aims to explain as much of the variability of observed changes as possible. To check how useful a linear regression equation is, tests can be performed on the square of correlation coefficient r. This tells us what percentage of variability in the y variable can be explained by the x variable. A correlation coefficient of 0.9 would demonstrate that 81% of the variability in Y is captured by variables X1-k used in the equation. The part which remains unexplained represents the residue (ε). So the smaller the residue better is the quality of model and its adjustment. Analysis of residues is a very significant step: it's at this stage that one sees the degree to that the model has been adapted to phenomena one wants to explain. It is residue analysis which also enables one to tell whether the tool has made it possible to estimate effects in a reasonable way or not. If significant anomalies are detected, regression model must not be used to estimate effects and original causal model must be re-examined, to see if further predictive variables can be introduced.


Related Discussions:- Construction of an explanatory model

Gains from international trade, Gains From International Trade The gai...

Gains From International Trade The gains from International trade are to make the participating countries better of than they would have otherwise been.   This will be the res

What is the efficient level of the public good, Consider an economy with tw...

Consider an economy with two individuals. Individual 1 has (inverse) demand curve for a public good given by P1=60-2Q1, While individual 2 has (inverse) demand curve for the public

Managerial economic, gap between economic theory and business practice

gap between economic theory and business practice

Central bank, CENTRAL BANK A modern central bank performs so many funct...

CENTRAL BANK A modern central bank performs so many functions of different nature that it is difficult to give any brief yet accurate definition of a central bank. Any definiti

Dominant strategy, In a one-shot game, if you advertise and your rival adve...

In a one-shot game, if you advertise and your rival advertises, you will each earn RM5 million in profits.  If neither of you advertises, your rival will make RM4 million and you w

Type of economic system, Question 1: (a) Briefly explain and distingui...

Question 1: (a) Briefly explain and distinguish between a centrally planned, laissez-faire and mixed economy. (b) According to you, which kind of economic system is most d

Function and importance, explain the supply function and importance of supp...

explain the supply function and importance of supply analysis in brief

Assumptions of monopolistic competition, Assumptions of Monopolistic Compet...

Assumptions of Monopolistic Competition Monopolistic competition as the name implies, combines features from both perfect competition and monopoly.  It has the following featu

Equilibria than continuous pricing, Two firms are engaged in Bertrand compe...

Two firms are engaged in Bertrand competition. Both firms have a stable marginal cost of €7. Presently, every firm is allocated half the market. There are 10,000 people in the popu

Stable and unstable equilibrium, Stable and Unstable Equilibrium An eq...

Stable and Unstable Equilibrium An equilibrium is said to be stable equilibrium when economic forces tend to push the market towards it.  In other words, any divergence from t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd