共查询到20条相似文献,搜索用时 172 毫秒
1.
Rohlf FJ 《Journal of human evolution》2003,44(6):665-683
Sampling experiments were performed to investigate mean square error and bias in estimates of mean shape produced by different geometric morphometric methods. The experiments use the isotropic error model, which assumes equal and independent variation at each landmark. The case of three landmarks in the plane (i.e., triangles) was emphasized because it could be investigated systematically and the results displayed on the printed page. The amount of error in the estimates was displayed as RMSE surfaces over the space of all possible configurations of three landmarks. Patterns of bias were shown as vector fields over this same space. Experiments were also performed using particular combinations of four or more landmarks in both two and three dimensions.It was found that the generalized Procrustes analysis method produced estimates with the least error and no pattern of bias. Averages of Bookstein shape coordinates performed well if the longest edge was used as the baseline. The method of moments (Stoyan, 1990, Model. Biomet. J. 32, 843) used in EDMA (Lele, 1993, Math. Geol. 25, 573) exhibits larger errors. When variation is not small, it also shows a pattern of bias for isosceles triangles with one side much shorter than the other two and for triangles whose vertices are approximately collinear causing them to resemble their own reflections. Similar problems were found for the log-distance method of Rao and Suryawanshi (1996, Proc. Nat. Acad. Sci. 95, 4121). These results and their implications for the application of different geometric morphometric methods are discussed. 相似文献
2.
Yang Xu Huirong Yang Heui-Yun Joo Jei-Hwa Yu Archer D Smith IV David Schneider Louise T Chow Matthew Renfrow Hengbin Wang 《Cell cycle (Georgetown, Tex.)》2013,12(19):3219-3220
Comment on: Portal MM. Proc Natl Acad Sci USA 2011; 108:8686-91. 相似文献
3.
《Cell cycle (Georgetown, Tex.)》2013,12(21):3617-3618
Comment on: Henderson A, et al. Proc Natl Acad Sci USA 2011; 108:6415-9. 相似文献
4.
《Cell cycle (Georgetown, Tex.)》2013,12(3):366-367
Comment on: Tran HT, et al. Proc Natl Acad Sci USA 2010; 107:16160-5. 相似文献
5.
《Cell cycle (Georgetown, Tex.)》2013,12(20):3411-3412
Comment on : Park JE, et al. Proc Natl Acad Sci USA 2011; 108:8200-05. 相似文献
6.
《Cell cycle (Georgetown, Tex.)》2013,12(23):3794-3795
Comment on: Rhodes DR, et al. Proc Natl Acad Sci USA 2009; 106:10284-9. 相似文献
7.
《Cell cycle (Georgetown, Tex.)》2013,12(7):1023-1024
Comment on: Boehler C, et al. Proc Natl Acad Sci USA 2011; 108:2783-8. 相似文献
8.
《Cell cycle (Georgetown, Tex.)》2013,12(4):632-633
Comment on: Mo M, et al. Proc Natl Acad Sci USA 2009; 106:19527-32. 相似文献
9.
《Cell cycle (Georgetown, Tex.)》2013,12(18):3343-3344
Comment on: Li F, et al. Proc Natl Acad Sci USA 2012; 109:10966-71. 相似文献
10.
《Cell cycle (Georgetown, Tex.)》2013,12(16):2967-2968
Comment on: Morin JA, et al. Proc Natl Acad Sci USA 2012; 109:8115-20. 相似文献
11.
Bethann N. Johnson Rakshita A. Charan Matthew J. LaVoie 《Cell cycle (Georgetown, Tex.)》2012,11(15):2775-2776
Comment on: Johnson BN, et al. Proc Natl Acad Sci USA 2012; 109:6283-8. 相似文献
12.
《Cell cycle (Georgetown, Tex.)》2013,12(17):3143-3144
Comment on: Cowell IG, et al. Proc Natl Acad Sci USA 2012; 109:8989-94. 相似文献
13.
《Cell cycle (Georgetown, Tex.)》2013,12(9):1671-1672
Comment on: Eelderink-Chen Z, et al. Proc Natl Acad Sci USA 2010; 107:2043-7. 相似文献
14.
《Cell cycle (Georgetown, Tex.)》2013,12(22):3627-3628
Comment on: Crist CG, et al. Proc Natl Acad Sci USA 2009; 106:13383-7. 相似文献
15.
《Cell cycle (Georgetown, Tex.)》2013,12(18):3349-3350
Comment on: Tan AY, et al. Proc Natl Acad Sci USA 2012; 109:6030-5. 相似文献
16.
Igor M. Samokhvalov 《Cell cycle (Georgetown, Tex.)》2012,11(16):2965-2966
Comment on: Tanaka Y, et al. Proc Natl Acad Sci USA 2012; 109:4515-20. 相似文献
17.
《Cell cycle (Georgetown, Tex.)》2013,12(18):3345-3346
Comment on: Maiti A, et al. Proc Natl Acad Sci USA 2012; 109:8091-6. 相似文献
18.
《Cell cycle (Georgetown, Tex.)》2013,12(13):2043-2044
Comment on: Boone DN, et al. Proc Natl Acad Sci USA 2010; 108:632-7. 相似文献
19.
《Cell cycle (Georgetown, Tex.)》2013,12(1):2-3
Comment on: Petriv OI, et al. Proc Natl Acad Sci USA 2010; 107:15443-8. 相似文献
20.
《Cell cycle (Georgetown, Tex.)》2013,12(4):623-624
Comment on: Viloria-Petit AM, et al. Proc Natl Acad Sci USA 2009;106:14028-33. 相似文献