For estimation of certain properties of molecule, useful information can be obtained from physical and other chemical phenomenon and transformed by mathematical and statistical method which is known as chemometrics. Many calibration problems related to analysis of spectral data can be solved by using chemometrics method. This review article mainly involves different chemometrics method and how we use these chemometrics methods in the optimization of method development. Among these all methods partial least square method has received great attention due to its importance. In recent time, the use of chemometrics is greatly enhanced due to its efficiency in analytical method development. So, the main aim of this review article is to understanding of all chemometrics method and use of those methods in method development.
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