Tiêu chuẩn Việt Nam TCVN 7220-2:2002 trình bày về chất lượng nước - đánh giá chất lượng nước theo chỉ số sinh học - phần 2: phương pháp diễn giải các dữ liệu sinh học thu được từ các cuộc khảo sát giun tròn (nematoda) và động vật không xương sống ở đáy cỡ trung bình (ĐVĐTB). | In addition to the new Windows interface, there are many added features to previous versions of PRIMER: easier and more flexible plotting options with 2-d MDS (for bubble plots, simple rotation etc); 3-d MDS plots; `draftsman' scatter plots of environmental variables; and histograms for the permutation distributions of test statistics. There are also several completely new analysis routines: BVSTEP, a matching procedure which generalises BIO- ENV and can be used, for example, to find `influential species' - small subsets of species capturing the full MDS community pattern: 2STAGE, a second-stage MDS in which relationships between a set of ordinations can be visualised (thus allowing a simple graphic summary of, say, the effect of using different data transformations and different taxonomic levels); an expanded set of diversity indices; simple species-area curves etc. Finally, a further unique feature of PRIMER v5 is the ability to calculate biodiversity indices based on the taxonomic distinctness or relatedness of the species making up a quantitative sample or species list, indices whose statistical properties are robust to variations in sampling effort.
