The General Linear Model: The Basics

Badi Baltagi

Chapter Chapter 7 in Econometrics, 2011, pp 151-177 from Springer

Abstract: Abstract Consider the following regression equation 7.1 $$y = X\beta + u$$ where $$y = \left[\begin{array}{c}Y_1\\ Y_2\\ \atop^{.}_{.}\\ Y_n\end{array} \right]; X = \left[ \begin{array}{cccc}X_{11} & X_{12} & \ldots & X_{1k}\\ X_{21} & X_{22} & \ldots & X_{2k}\\ \atop^{.}_{.} & \atop^{.}_{.} & \atop^{.}_{.} & \atop^{.}_{.}\\ X_{n1} & X_{n2} & \ldots & X_{nk} \end{array} \right]; \beta = \left[ \begin{array}{c}\beta_1\\ \beta_2\\ \atop^{.}_{.}\\ \beta_k \end{array} \right]; u = \left[\begin{array}{c}u_1\\ u_2\\ \atop^{.}_{.}\\ u_n \end{array}\right]$$ with n denoting the number of observations and k the number of variables in the regression, with n > k. In this case, y is a column vector of dimension (n×1) and X is a matrix of dimension (n × k). Each column of X denotes a variable and each row of X denotes an observation on these variables. If y is log(wage) as in the empirical example in Chapter 4, see Table 4.1 then the columns of X contain a column of ones for the constant (usually the first column), weeks worked, years of full time experience, years of education, sex, race, marital status, etc.

Keywords: Mean Square Error; Lagrange Multiplier; Characteristic Root; Wald Statistic; Full Column Rank (search for similar items in EconPapers)
Date: 2011
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DOI: 10.1007/978-3-642-20059-5_7

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