Regression Diagnostics - Identifying Influentail Data and Sources of Collinearity

This work provides practicing statisticians and econometricians with new tools for assessing quality and reliability of regression estimates. Diagnostic techniques are developed with it, that aid in the systematic location of data points that are unusual or inordinately influential. It measures the presence and intensity of collinear relations among the regression data and helps to identify variables involved in each and pinpoint estimated coefficients potentially most adversely affected. It emphasizes diagnostics, and includes suggestions for remedial action.