Vol: 34 Page: 177

Authors:
Małgorzata Szczepanik
Mirosława Wesołowska-Janczarek
Dariusz Dziki

Title:
 Application of dummy variables to comparison of regression equations

Language: Polish

Keywords:
multiple regression
comparison of regression equations
extra sums of squares

Summary:
We present tests which make possible comparison of regression equations’ coefficients. We introduce dummy variables and use the method of extra sum of squares (Draper, Smith, 1998). Regression dependence of grain mass of barley on its width and length is considered. Three regression equations in accordance with different levels of grain’s moisture are compared.