Portland MSA bias factor (IMAGE) Washington University in St. Louis Caption Demonstration of how intricacies can be lost without a bias factor. Credit Rajan Chakrabarty/Payton Beeler Usage Restrictions Use allowed with proper attribution License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.