Trigger-Point
发表于 2025-3-23 11:12:32
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真繁荣
发表于 2025-3-23 16:30:44
Heather Parris-Kidd,Jenny Barnettarth 1977, Noy-Meir & Whittaker 1977, Orlóci 1978, Gauch, Whittaker & Singer 1979) have found faults with all ordination techniques currently in use, at least when applied to ecological data specifying the occurrences of species in community samples. These faults certainly do not make existing techn
Endometrium
发表于 2025-3-23 19:27:40
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Hyperopia
发表于 2025-3-23 23:36:23
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CRATE
发表于 2025-3-24 05:47:47
Heather Parris-Kidd,Jenny Barnettata. There are several comparative studies of such techniques, but few employ field data. I have distilled from the literature several hypotheses concerning the relative merits of polar ordination (PO), principal components analysis (PCA), reciprocal averaging (RA), and multidimensional scaling (MDS
Exonerate
发表于 2025-3-24 10:03:48
Danny Chung-hong Leung,Crisp PeterThe study area usually has a size between some hundred and some ten thousand ha, thus falling within an ecological sector or an ecological region (Manil 1963). The relations between species and ecological variables depend on the size and the choice of the studied area (Thiébaut et al., 1978); climat
Occipital-Lobe
发表于 2025-3-24 14:18:57
https://doi.org/10.1007/978-981-13-1984-6. Since, as Shakespear says, ‘There is occasions and causes why and wherefore in all things’, some explanation of this is needed. The confusion existing over the plethora of similarity measures and the profusion of competing methodologies suggests that a stronger theoretical foundation is required,
Stable-Angina
发表于 2025-3-24 17:22:59
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借喻
发表于 2025-3-24 22:17:34
https://doi.org/10.1007/978-981-13-1984-6 species recorded for a number of samples, resulting in a species-by-samples matrix of observations. Multivariate analysis of such data has three general aims: (1) to identify similar, redundant samples, (2) to identify outliers (samples very different from all other samples), and (3) to elucidate r
逃避责任
发表于 2025-3-25 00:22:10
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