Measurements

John Wolberg's Data Analysis Using the Method of Least Squares: Extracting PDF

By John Wolberg

ISBN-10: 3540256741

ISBN-13: 9783540256748

The most well-liked approach to facts research of quantitative experiments is the tactic of least squares. usually, in spite of the fact that, the entire energy of the tactic is ignored and extremely few books care for this topic on the point that it merits. the aim of knowledge research utilizing the strategy of Least SquaresВ is to fill this hole and comprise the kind of details required to aid scientists and engineers practice the strategy to difficulties of their certain fields of curiosity. moreover, graduate scholars in technology and engineering doing paintings of experimental nature can make the most of this e-book. rather, either linear and non-linear least squares, using experimental errors estimates for facts weighting, approaches to incorporate previous estimates, technique for choosing and testingВ models, prediction research, and a few non-parametric equipment are mentioned.

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Rel_Errorr is (Y - y) / σy . 6 and fit using y = a1 + a2x. Rel_Errorr is (Y - y) / σy . 2 The effect of erroneous data points is discussed in the section on "outliers". 6). This is a real concern of all experimentalists and care should be taken to search for outliers in any data set. The cause of outliers can be errors in data collections, errors in computer pre-processing of the data or even human error. , not errors) and are perhaps due to an unexpected phenomenon. 48. This can happen, for example, when data is being collected by hand and the person recording the data misplaces the decimal point.

Standard normal) distribution. In other words, this model is a parabola with a noise component that is approximately 5% of the "true" value of y. It should be emphasized that we don’t know and can't measure the values of ui. All that we know is that the values of Y include about 5% random noise. 2. 483 and seem to be distributed around zero as one would expect because the chosen model is representative of the data. 37) and they are clearly not distributed randomly about zero. This type of result is due to the choice of a function f that is clearly not representative of the data.

My thesis was a study of the fast fission effect in heavy water nuclear reactors and I was reviewing previous measurements of this effect [WO62]. Experimental results from two of the national laboratories were curiously different. Based upon the values and quoted σ ’ss, the numbers were many σ ’s apart. I discussed this with my thesis advisors and we agreed that one or both of the experiments was plagued by systematic errors that biased the results in a particular direction. We were proposing a new method which we felt was much less prone to systematic errors.

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Data Analysis Using the Method of Least Squares: Extracting the Most Information from Experiments by John Wolberg


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