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weighted total least squares for mutually correlated coordinates 1.0

  Date Added: June 09, 2013  |  Visits: 239

weighted total least squares for mutually correlated coordinates

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The problem of fitting a straight line to data with uncertainties in both coordinates is solved using a weighted total least-squares algorithm. The parameters are transformed from the usual slope/y-axis intersection pair to slope angle and distance to the origin. The advantages of this are that a) global convergence is assured b) a solution is found even for a vertical line. The complete uncertainty matrix (i.e. variances AND covariance of the fitting parameters) is determined. For non-vertical straight lines the usual parameters (slope/y-axis intersect.) are also given, together with their uncertainty matrix. The algorithm is especially useful for precision measurements, where the knowledge of the complete uncertainty matrix is a must. In addition to our previous version wtls_line.m, now a vector of correlation coefficients rho can be given as input. However, great care has to be taken in order to provide an adequate value. We strongly recommend to consult the publicaton in order to see how to estimate the input rho. A hint is given in the help text. The algorithm is published in Measurement Science and Technology 22 (2011) by M.Krystek and M.Anton, Physikalisch-Technische Bundesanstalt Braunschweig, Germany.

Requirements: No special requirements
Platforms: Matlab
Keyword: Coefficients Correlation Great Input Previous Vector Version Wtls Linem
Users rating: 0/10

License: Shareware Size: 10 KB
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