A fixed-effects regression model with a tree for country clusters and a tree for nonlinear covariate effects is proposed and tested on European quality-of-life data.
Stat Probab Lett 81: 451–459
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Flexible tree-structured regression for clustered data with an application to quality of life in older adults
A fixed-effects regression model with a tree for country clusters and a tree for nonlinear covariate effects is proposed and tested on European quality-of-life data.