@article{Ahmed_Ismail_2014, title={Selection of Variables in Quantile Regression (Linear Lasso- Goal Programming)}, volume={2}, url={https://www.ajouronline.com/index.php/AJAS/article/view/2011}, abstractNote={<p>Quantile regression is a statistical technique intended to estimate, and conduct inference about the conditional quantile functions. Since Koenker and Bassett (1978) introduced quantile regression, which models conditional quantiles as functions of predictors. The quantile regression can give complete information about the relationship between the response variable and covariates on the entire conditional distribution, and has no distributional assumption about the error term in the model.<strong> </strong>The study evaluates the performance of three methods; two methods of linear programming linear lasso ( <!--?mso-application progid="Word.Document"?--> 12L1"> -Lasso, <!--?mso-application progid="Word.Document"?--> 12L2"> -Lasso) and one method of Goal programming. The three methods are used to select the best subset of variables and estimate the parameters of the quantile regression equation when four error distributions, with two different sample sizes and two different parameters for each error distribution. The study found that the estimated risk and relative estimated risk which produced from Goal programming method is less than ER and ERE of ( <!--?mso-application progid="Word.Document"?--> 12L1"> -Lasso and <!--?mso-application progid="Word.Document"?--> 12L2"> -Lasso methods.</p>}, number={6}, journal={Asian Journal of Applied Sciences}, author={Ahmed, Neveen Sayed and Ismail, Elham Abdul-Razik}, year={2014}, month={Dec.} }