title: A novel PI index and its applications to QSPR/QSAR studies.
abstract: A novel topological index, PI (Padmakar-Ivan index), is derived in this paper. The index is very simple to calculate and has disseminating power similar to that of the Wiener (W) and the Szeged (Sz) indices. The comprehensive studies show that the proposed PI index correlates highly with W and Sz as well as with physicochemical properties and biological activities of a large number of diversified and complex compounds. The proposed PI index promises to be a useful parameter in the QSPR/QSAR studies. The stability of each model is demonstrated by applying cross-validation test. Furthermore, more favorable comparison with other representative indices such as the Randic index is also made in order to establish the predictive ability of the PI index. The results have shown that in several cases the PI index gave better results.
authors.affiliation: Research Division, Laxmi Pest & Fumigation Pvt. Ltd., Indore, India. pvkhadikar@yahoo.com
authors.forename: P V
authors.initials: PV
authors.lastname: Khadikar
authors.forename: S
authors.initials: S
authors.lastname: Karmarkar
authors.forename: V K
authors.initials: VK
authors.lastname: Agrawal
mesh_terms: D000473:Alkanes / Q000737:chemistry*; D001234:Aspergillus niger / Q000187:drug effects; D019905:Benzyl Alcohol / Q000494:pharmacology; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D008956:Models, Chemical; D015394:Molecular Structure; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D021281:Quantitative Structure-Activity Relationship; D012044:Regression Analysis
chemical_list: D000473:Alkanes; D011078:Polychlorinated Biphenyls; D019905:Benzyl Alcohol