9/27/11

Making an algebraic equation from statistical results


This post will go over the transformation process of statistical results, and show how to derive an algebraic function from your results table.

You have just been hired by Gameday Sportswear, a large producer of college football apparel. Your boss has given you the regression below, and wants you to answer the following questions.
Estimated Demand Function
Dependent Variable is QJ


Variable Coefficient T-Stat
Constant (C) 105.05 1.874
Real price of college football jerseys (PF) -1.8 -3.961
Real price of NFL jerseys (PNFL) -1.1 -3.214
Real Advertising Expenditure (A) 2.6 4.025
Income (Inc) 1.9 3.848
R^2 0.655


Estimated Supply Function
Dependent Variable is QJ


Variable Coefficient T-Stat
Constant (C) 30.1 0.943
Real price of college football jerseys (PF) 4.6 3.438
Real price of materials (PM) -8.3 -3.268
Real labor wage (PL) -4.6 -4.914
Technology Index (T) 12.5 2.199
R^2 0.741
Description of Variables
Variable Definition Average
C Constant
QJ Quantity of football jerseys produced and sold (1,000 units)
PF Real price of college football jerseys
PNFL Real price of NFL jerseys $40
PM Real Price of materials $4
PL Real Labor Wage $16
A Real Advertising Expenditure ($1,000s) $90
Inc Real Income ($1,000s) $34
T Tech. Index 18

1. What is the estimated demand function equation for Gameday football jerseys?
The estimated demand function will take the general regression format of Y = B1X1 + B2X2 + B3X3 etc.

So in this particular case it will look like:

QJ = B1C + B2 PF + B3 PNFL + B4 A + B5 Inc

The B’s represent the coefficients associated with each independent variable, and they are estimated to show how a change in that particular variable will affect our dependent variable QJ.

2. What is the estimated supply function equation for Gameday football jerseys?

The supply function written in algebraic form will look like:

QJ = B1C + B2 PF + B3 PM + B4 PL + B5 T

Keep in mind that we are doing things backwards in this particular problem.  Normally you make the algebraic function first (what independent variables that you think will impact your dependent variable) and then you run your regression analysis to find values for your coefficients and their associated T-stats.
Spread the knowledge!
Technorati Digg This Stumble Stumble Facebook Twitter

2 comments:

Anonymous said...

where do you get P(F) because there isn't any P(F) in the problem?

freeeconhelp on September 27, 2011 at 3:36 PM said...

sorry bout that, mislabeled, corrected now.

Post a Comment

 

I invite you to join dropbox!

I invite you to join dropbox!
Use the above link for an extra 250MB Free!
All content on this site is the copyright of webmaster. No re-posting is permitted. Powered by Blogger.
VigLink badge

Post Archive

| FreeEconHelp.com, Learning Economics... Solved! © 2009. All Rights Reserved | Template Style by My Blogger Tricks .com | Design by Brian Gardner Back To Top