A systematic error in maximum likelihood fitting

被引:11
|
作者
Bergmann, UC [1 ]
Riisager, K [1 ]
机构
[1] Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus C, Denmark
关键词
maximum likelihood; Poisson distribution; biased estimate;
D O I
10.1016/S0168-9002(02)00864-1
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The maximum likelihood method is normally regarded as the safest method for parameter estimation, We show that this method will give a bias in the often occurring situation where a spectrum of counts is fitted with a theoretical function, unless the fit function is very simple. The bias can become significant A hen the spectrum contains less than about 100 counts or when the fit interval is too short. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:444 / 447
页数:4
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