INFORMATION-THEORY APPLIED TO QUALITATIVE-ANALYSIS

Fundamental aspects of information theory and its usefulness for qualitative analysis are discussed in view of the applications described so far in the literature. General expressions for the uncertainty, information, equivocation and information content are described and related to the more commonly used expressions of the information parameters. It is shown that the information content (or equivocation) can serve - with certain restrictions - as an important criterion for the evaluation, selection or optimization of analytical procedures. The information theoretical concepts are easy to apply to one-channel identification or classification procedures. However, when multi-channel procedures (combinations of one-channel procedures) are involved, a straightforward use of information theory is to a large extent restricted by the excessive computations. Therefore, the further development of simple methods for the calculation of reliable estimates of information contents and of optimization strategies enabling the calculation of only small numbers of information contents, is of great importance for the future use of information theory in qualitative analysis. © 1979 Springer-Verlag.