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These techniques define mappings through a set of axis vectors, each associated with a data variable, which users can manipulate interactively to create different plots and analyze data from multiple points of view. However, updating the direction and length of an axis vector is far from trivial. Users must consider the data analysis task, domain knowledge, the directions in which values should increase, the relative importance of each variable, or the correlations between variables, among other factors. Another issue is the difficulty to approximate high\u2010dimensional data values in the two\u2010dimensional visualizations, which can hamper searching for data with particular characteristics, analyzing the most common data values in clusters, inspecting outliers, etc. In this paper we present and analyze several optimization approaches for enhancing radial axes plots regarding their ability to represent high\u2010dimensional data values. The techniques can be used not only to approximate data values with greater accuracy, but also to guide users when updating axis vectors or extending visualizations with new variables, since they can reveal poor choices of axis vectors. The optimal axes can also be included in nonlinear plots. In particular, we show how they can be used within RadViz to assess the quality of a variable ordering. The in\u2010depth analysis carried out is useful for visualization designers developing radial axes techniques, or planning to incorporate axes into other visualization methods.<\/jats:p>","DOI":"10.1111\/cgf.14323","type":"journal-article","created":{"date-parts":[[2021,6,29]],"date-time":"2021-06-29T16:48:33Z","timestamp":1624985313000},"page":"483-494","update-policy":"https:\/\/2.zoppoz.workers.dev:443\/https\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Optimal Axes for Data Value Estimation in Star Coordinates and Radial Axes Plots"],"prefix":"10.1111","volume":"40","author":[{"ORCID":"https:\/\/2.zoppoz.workers.dev:443\/https\/orcid.org\/0000-0002-8692-2553","authenticated-orcid":false,"given":"M.","family":"Rubio\u2010S\u00e1nchez","sequence":"first","affiliation":[{"name":"Universidad Rey Juan Carlos  Madrid Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/2.zoppoz.workers.dev:443\/https\/orcid.org\/0000-0002-8089-4408","authenticated-orcid":false,"given":"D. 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