Contributions to Econometrics and Statistics Today: In by Prof. Dr. Hans Schneeweiss, Prof. Dr. Heinrich Strecker

By Prof. Dr. Hans Schneeweiss, Prof. Dr. Heinrich Strecker (auth.), Prof. Dr. Hans Schneeweiss, Prof. Dr. Heinrich Strecker (eds.)

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Extra info for Contributions to Econometrics and Statistics Today: In Memoriam Günter Menges

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In practice, various things, basic or additional, other than the real-world system being portrayed, can affect the final picture - the special apparatus used for observation (spectroscope versus eyeball), the rules used (mathematical logic, principles, standards of propriety), the surface on which the painting is done (boundary conditions), the fact that it may be a continuation of previous work, and, potentially most influential of all, the tastes and biases of the individual or group doing the investigation.

Schneeweiss and H. Strecker © Springer-Verlag Berlin Heidelberg 1985 53 the observational process that generates our contact with the system. This is to recognize that we are ultimately modelling the interconnections and relations among observables as defined by the observational process. As the fundamental rule is designed to protect against personal peculiarities, its subsidiary purpose is to ensure that observations if not already quantified must be quantifiable and obtained in accord with fixed rules by stated apparatus, in order to be repeatable in the sense needed for confirmation.

Apparatus and rules will then be recognized as an important part of the full conceptualization of the system, and in effect, dependence of the final picture on these inextricable elements is obviated by explicit recogniti on. The scientific model makes explicit the relationships among observables, and the practi cal mechanisms for observing are fully prescribed, in order to admit verification with repeated and repeatable observation. With this in mind we will speak of a valid model - objective or realistic in accord with the standard definitions of these words.

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