延迟贴现任务的适配模型选择:四种贴现模型的对比研究

Fitting Model Selection for Delay Discounting

目的:对四种延迟贴现模型(两个单参数贴现模型:指数衰减模型和双曲线模型;两个双参数模型:类双曲线模型和幂函数模型)进行比较,选择最优模型用于贴现数据拟合。方法:分别用四种贴现模型对61名青少年被试的延迟贴现数据进行拟合,比较它们在群组水平和个体水平的拟合情况。结果:1无论是在群组水平还是在个体水平,双参数模型对贴现数据拟合的有效性、适配性均优于单参数贴现模型;2两双参数模型的参数s均显著小于1,其增加合理。结论:双参数模型优于单参数模型。

Objective： The present study compared four discounting models（two one-parameter models： the exponential decay model and the hyperbola model, and two two-parameter models： the hyperboloid-like model and the power exponential function model） in order to select an optimal fitting discounting model. Methods： The delay discounting data of sixty-one adolescents were fitting separately into the four discounting models, and the fitting indexes in the four models were com-pared at both group and individual levels. Results： （1）Two-parameter models were more better-fitting than one-parameter models both on data fitting validity and parameter estimates. （2）The parameter s of both two-parameter models were significantly less than 1.0, and its increase was reasonable. Conclusion： Two-parameter models provides more-to-excellent fits than one-parameter models for the delay discounting.