An ERD (Entity Relationship Diagram) is a graphical representation of the data in rest within a system (e.g. a business, an organization, an application) that is subject to analysis.
1. REFERENCE DOSE (RfD): DESCRIPTION AND USE IN HEALTH RISK ASSESSMENTS. 1.1. INTRODUCTION. This concept paper describes the U.S. Environmental Protection Agency's (U.S. EPA) principal approach to and rationale for assessing risk for health effects other than cancer and gene mutations from chronic chemical exposure.
In the process, the Work Group has coined less value-laden terminology -- reference dose (RfD), uncertainty factor (UF); margin of exposure (MOE); and regulatory dose (RgD) -- to clarify and distinguish between aspects of risk assessment and risk management.