This is an introduction to solving an equation with a single missing variable. (tes.com)
The problem of missing variables Janni Niclasen's study looks at the results of a large population study conducted between 1996 and 2002. (sciencedaily.com)
One key missing variable is actual student behavior: researchers observe only the infraction as recorded by school personnel, who could exhibit bias in how they map behavior to infractions even if not in how infractions map to punishment. (educationnext.org)