Estimating growth charts via nonparametric quantile regression: a practical framework with application in ecology |
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| Authors: | Vito M R Muggeo Mariangela Sciandra Agostino Tomasello Sebastiano Calvo |
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| Institution: | 1. Dipartimento Scienze Statistiche e Matematiche ‘Vianelli’, Università di Palermo, Palermo, Italy
2. Dipartimento Scienze della Terra e del Mare, Università di Palermo, Palermo, Italy
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| Abstract: | We discuss a practical and effective framework to estimate reference growth charts via regression quantiles. Inequality constraints are used to ensure both monotonicity and non-crossing of the estimated quantile curves and penalized splines are employed to model the nonlinear growth patterns with respect to age. A companion R package is presented and relevant code discussed to favour spreading and application of the proposed methods. |
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