Chemometric methods
Chemometric methods derive mathematical models (quantitative structure activity relation- ships: QSARs) describing a biological activity of interest (or a profile of such activities) in terms of chemical parameters (measured, from tabulations, or computed). QSAR expressions allow to make estimates of biological properties of new compounds and can thus aid in decision making for further syntheses and/or biological testing. They can also provide information on the mechanism of action.
Directed at saving experimental work and increasing the chances of success in drug discovery projects, chemometric methods of drug design (QSAR) supplement molecular modeling and de novo design techniques and offer indispensable support
	for the extraction of information from the ever increasing amount of data
	to address pharmacokinetic aspects as well as possible toxicities or undesired side effects of therapeutic agents or agrochemicals at an early stage of compound development
	for "hit to lead" decisions and lead optimization
	for the design of libraries or representative training series of compounds
	for risk assessment.
The thousands of known QSARs attest to the versatility of chemometric drug design methods, and QSARs have been used successfully in many cases of new compound design. Series design increases the information gained per compound tested. Chemometric methods are supplemented by similarity considerations, tropological approaches, and methods based on mathematical logics.