Quadratic growth curves of 2nd degree polynomial are widely used in longitudinal studies. For a 2nd degree polynomial, the vertex represents the location of the curve in the XY plane. For a quadratic growth curve, we propose an approximate confidence region as well as the confidence interval for x and y-coordinates of the vertex using two methods, the gradient method and the delta method.
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- Partial requirement for: Ph. D., Arizona State University, 2015Note typethesis
- Includes bibliographical references (pages 143-145)Note typebibliography
- Field of study: Statistics