## Quantile regression with group Lasso for classification.(English)Zbl 1414.62318

Summary: Applications of regression models for binary response are very common and models specific to these problems are widely used. Quantile regression for binary response data has recently attracted attention and regularized quantile regression methods have been proposed for high dimensional problems. When the predictors have a natural group structure, such as in the case of categorical predictors converted into dummy variables, then a group lasso penalty is used in regularized methods. In this paper, we present a Bayesian Gibbs sampling procedure to estimate the parameters of a quantile regression model under a group lasso penalty for classification problems with a binary response. Simulated and real data show a good performance of the proposed method in comparison to mean-based approaches and to quantile-based approaches which do not exploit the group structure of the predictors.

### MSC:

 62J07 Ridge regression; shrinkage estimators (Lasso) 62H30 Classification and discrimination; cluster analysis (statistical aspects) 62F15 Bayesian inference

### Software:

reglogit; glmnet; gglasso; UCI-ml
Full Text:

### References:

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