• Thomas B. Fomby
  • Stanley R. Johnson
  • R. Carter Hill


There are certain circumstances in which the assumption of constant error variance, homoscedasticity, in the linear model is not tenable. For example, in cross-sectional analysis in economics, the units under investigation are usually firms, households, or individuals, and the degree to which the linear equation explains their behavior may depend upon their specific characteristics. We illustrate this point by the use of three examples.


Error Variance Maximum Likelihood Estimator Likelihood Ratio Statistic Advertising Expenditure Chow Test 
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Copyright information

© Springer Science+Business Media New York 1984

Authors and Affiliations

  • Thomas B. Fomby
    • 1
  • Stanley R. Johnson
    • 2
  • R. Carter Hill
    • 3
  1. 1.Department of EconomicsSouthern Methodist UniversityDallasUSA
  2. 2.The Center for Agricultural and Rural DevelopmentIowa State UniversityAmesUSA
  3. 3.Department of EconomicsLouisiana State UniversityBaton RougeUSA

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