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Eriksen, Steven E.1
Gordon, Sheldon P.1
Kopcso, David P.1
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Assessing the Appropriateness of Transformations Using Simulation
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Dambolena, Ismael; Eriksen, Steven E.; Kopcso, David P. – PRIMUS, 2006
The logarithmic transformation is a commonly applied procedure in regression analysis when two or more variables have a nonlinear relationship. When the response variable is logarithmically transformed, confidence intervals for conditional means and predictions may actually be wider than their counterparts obtained from the model with the original…
Descriptors: Intervals, Prediction, Transformations (Mathematics), Multiple Regression Analysis
Fitting Surge Functions to Data
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Gordon, Sheldon P. – PRIMUS, 2006
The problem of fitting a surge function to a set of data such as that for a drug response curve is considered. A variety of different techniques are applied, including using some fundamental ideas from calculus, the use of a CAS package, and the use of Excel's regression features for fitting a multivariate linear function to a set of transformed…
Descriptors: Maximum Likelihood Statistics, Calculus, Transformations (Mathematics), Mathematical Applications