Learn about planning experiments and variables when working scientifically with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize.

KEVIN A. CLARKE, The Phantom Menace: Omitted Variable Bias in Econometric Research, Conflict Management and Peace Science, Vol. 22, No. 4, SPECIAL ISSUE: Model Specification and Control Variables ...

John Campbell, Control Variables and Mental Causation, Proceedings of the Aristotelian Society, New Series, Vol. 110 (2010), pp. 15-30 ...