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Subhash C. Basak and Subhabrata Majumdar
Mathematical chemistry or more accurately discrete mathematical chemistry had a tremendous growth spurt in the second half of the twentieth century and the same trend is continuing in the twenty first century. This continual growth was fueled primarily by two major factors: 1) Novel applications of discrete mathematical concepts to chemical and biological systems, and 2) Availability of high speed computers and relevant software whereby hypothesis driven as well as discovery oriented research on large data sets could be carried out. This led to the development of not only a plethora of new concepts, but also to various useful applications. This chapter will discuss the major milestones in the development of hierarchical QSARs for the prediction of physical as well as biological properties of various classes of chemicals by the Basak group of researchers using mathematical descriptors and different statistical methods.
Property-activity relationship (PAR), graph theory, molecular graphs, weighted pseudograph, graph theoretic matrices, adjacency matrix, distance matrix, topological indices, topostructural indices, topochemical indices, information theoretic indices, connectivity indices, valence connectivity indices, E-state indices, quantum chemical descriptors, hierarchical quantitative structure-activity relationship (HiQSAR), partial least square (PLS), principal components regression (PCR), principal components analysis (PCA), ridge regression (RR), naïve q2, true q2, proper cross validation, leave one out (LOO) method, Envelope models, interrelated two-way clustering, linear discriminant analysis, mutagenicity, congenericity principle, diversity begets diversity principle, big data.
International Society of Mathematical Chemistry, 1802 Stanford Avenue, Duluth, MN 55811, USA.