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Model validation

Currently, here are only questions about the reciever operating curve (ROC).
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ID P Question or exercise
3960 1 What should be on vertical and on horisontal axis of a ROC graph when estimating reliability of a predictive distribution map for a rare plant species? Open
4051 3 The attached file contains presence absence records of two orchid species together with similarity values (as percentages) to a set of exemplar sites of the species.
  1. Which species presence is better predicted by the site similarity according to the ROC AUC?
  2. Which is the TPR and FPR for both species if to use threshold level 0.5?
  3. At which thershold level is the species presence recognition the highest?