WASHINGTON, Jan. 26 -- The U.S. Census Bureau issued the following working paper (No. POP-WP109) entitled "Race Reporting Among the Hispanic Population: 2020." The paper was written by Jessica E. Pena, Alli Coritz and Merarys Rios-Vargas. Here are excerpts: * * * Introduction Over the past decade and a half, the Census Bureau has undertaken several major research projects on how to collect, code, and tabulate race and ethnicity data, illustrating the agency's commitment to improving the validity and reliability of census data. Some of the  more PR