Some of the more common estimation techniques for linear regression are summarized below. In this case, we “hold a variable fixed” by restricting our attention to the subsets of the data that happen to have a common value for the given predictor variable. Algorithms also differ on whether they navigate to this website the factor matrix T as an orthogonal (that is, orthonormal) matrix or not. Accessed 2 Sept 2011″ href=”#ref-CR12743″ id=”ref-link-section-d30404488e418″>2004; Jørgensen and Goegebeur