9.1 Topic 9. Factorial Experiments [ST&D Chapter 15] 9. 1. Introduction A common objective in research is to investigate the effect of each of a number of ...
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...Topic factorial experiments introduction a common objective in research is to investigate the effect of each number variables or factors on some response variable earlier times were studied one at time with separate devoted later r fisher pointed out that important advantages are gained by combining study several same experiment treatment structure consists all possible combinations levels under investigation experimentation highly efficient because observation provides information about also systematic method investigating relationships among effects different i e interactions terminology classes treatments an called g fertilization medication etc categories within factor and lbs n acre doses experimental drug we will denote upper case letters b c lower subscripts mean units receiving combination ab be denoted refer two for as x referred xx example below crd involving nitrogen phosphorous p applied crop yield level bi se me differences simple between means main way using this data con...