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5. CUSUM型统计量中调节参数对变点估计效果的影响分析

CUSUM型统计量中调节参数对变点估计效果的影响分析

来源 :中国科学技术大学学报 | 被引量 : 0次 | 上传用户：wangpeng532

【摘 要】

：

CUSUM型变点估计量中的调节参数,理论上一般假定其取值范围为(0,1),但在实际数据的变点估计时,不同的取值往往得到相异的结果.基于跳跃度变点模型,利用蒙特卡罗方法,研究了调节参数的取值对变点估计结果的影响.模拟结果发现:在跳跃度较大时,无论变点真实位置如何,变点估计值基本不受调节参数取值的影响;但在跳跃度较小时,调节参数的取值对变点估计结果有显著影响;特别在变点真实位置靠近序列其中任意一个端点时,调节参数取值为0.5时,估计的效果最好;当变点真实位置靠近中间时,调节参数的取值越小,估计效果越好.在模拟

【作 者】

：

谭常春 江敏 

【机 构】

：

合肥工业大学经济学院,安徽合肥230009

【出 处】

：

中国科学技术大学学报

【发表日期】

：

2020年7期

【关键词】

：

变点 CUSUM型估计量 调节参数 

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论文部分内容阅读

CUSUM型变点估计量中的调节参数,理论上一般假定其取值范围为(0,1),但在实际数据的变点估计时,不同的取值往往得到相异的结果.基于跳跃度变点模型,利用蒙特卡罗方法,研究了调节参数的取值对变点估计结果的影响.模拟结果发现:在跳跃度较大时,无论变点真实位置如何,变点估计值基本不受调节参数取值的影响;但在跳跃度较小时,调节参数的取值对变点估计结果有显著影响;特别在变点真实位置靠近序列其中任意一个端点时,调节参数取值为0.5时,估计的效果最好;当变点真实位置靠近中间时,调节参数的取值越小,估计效果越好.在模拟和实例分析基础上,提出了基于数据驱动的调节参数的选取方法,使得CUSUM型变点估计量更具稳健性.

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