Analysis of tomato root initiation using a normal mixture distribution

被引:24
作者
Gutierrez, RG [1 ]
Carroll, RJ [1 ]
Wang, NY [1 ]
Lee, GH [1 ]
Taylor, BH [1 ]
机构
[1] TEXAS A&M UNIV,DEPT BIOL,COLLEGE STN,TX 77843
关键词
Box-Cox Transformation; cluster analysis; normal mixture; likelihood ratio test;
D O I
10.2307/2533276
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
We attempt to identify the number of underlying physical phenomena behind tomato lateral root initiation by using a normal mixture distribution coupled with the Box-Cox power transformation. An initial analysis of the data suggested the possibility of two (possibly more) subpopulations, but upon taking reciprocals, the data appear to be very nearly Gaussian. A simulation study explores the possibility of erroneously detecting a second subpopulation by fitting data which are improperly scaled. A power calculation suggests that only unrealistically large sample sizes can detect the unbalanced mixtures one might expect with data of this type.
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收藏
页码:1461 / 1468
页数:8
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