Undercoverage Posted on 24th December 20153rd May 2021 by ThePD (The Project Definition) Undercoverage is a type of selection bias that results from the omission from the frame of units. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Business and tagged analysis. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.