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- Convex Hulls Filled Polygons
A convex hull is an overlay that uses a polygon to enclose all of the points in a group.
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* NMS (NMDS) features Built-in randomization test, real-time stress plots
Although some similar tools are available in PC-ORD and R, the user experience differs radically. PC-ORD is a Windows software program with a graphical user interface that does not require coding. PC-ORD offers ease of use, expert-driven analysis preference options, the power and flexibility of interactive graphics, a built-in help system, and free dedicated technical support. PC-ORD also allows advanced users to develop scripts through its "Batch" facility (introduced in v.6), as well as the ability to incorporate user-developed modules into the menu system.
Phi Coefficient for Indicator Species
Tichý and Chytrý's (2006) phi coefficient is a method for evaluating the indicator value (or diagnostic value) of a species with respect to a one-way grouping of sample units. It applies only to presence-absence data. If have quantitative data you choose this option in the Indicator Species Analysis Setup, then the data are automatically converted to presence-absence. Any value greater than zero is transformed to 1, while values less than or equal to zero are transformed to zero. Tichý and Chytrý's method corrects for unequal sample sizes among groups. The adjusted phi coefficient also allows comparisons across studies with different sample sizes.
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