<unk>  <unk>  is the process by which chemical<unk>  is<unk> ly correlated with a well defined process, such as biological<unk>  or chemical reactivity.
For example, biological<unk>  can be expressed<unk> ly as in the concentration of a substance required to give a certain biological response.  Additionally, when physiochemical properties or<unk> s are expressed by numbers, one can form a mathematical<unk> , or<unk> , between the two.  The mathematical expression can then be used to predict the biological response of other chemical<unk> s.<unk> 's most general mathematical form is:
Quantitative structure-activity relationship
Clinical prediction rule
Agent study
Risk factor template
Selectable marker
Epidemiological methods
Design of experiments
Screening template