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Such a function would output a low value if the profiles are strongly correlated\u2014either negatively or positively\u2014and vice versa. One popular distance function is the absolute correlation distance, $$d_a=1-|\\rho |$$<\/jats:tex-math>\n \n \n d<\/mml:mi>\n a<\/mml:mi>\n <\/mml:msub>\n =<\/mml:mo>\n 1<\/mml:mn>\n -<\/mml:mo>\n \n |<\/mml:mo>\n \u03c1<\/mml:mi>\n |<\/mml:mo>\n <\/mml:mrow>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>, where $$\\rho$$<\/jats:tex-math>\n \u03c1<\/mml:mi>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> is similarity measure, such as Pearson or Spearman correlation. However, the absolute correlation distance fails to fulfill the triangle inequality, which would have guaranteed better performance at vector quantization, allowed fast data localization, as well as accelerated data clustering.<\/jats:p>\n <\/jats:sec>\n Results<\/jats:title>\n In this work, we propose $$d_r=\\sqrt{1-|\\rho |}$$<\/jats:tex-math>\n \n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n =<\/mml:mo>\n \n \n 1<\/mml:mn>\n -<\/mml:mo>\n |<\/mml:mo>\n \u03c1<\/mml:mi>\n |<\/mml:mo>\n <\/mml:mrow>\n <\/mml:msqrt>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> as an alternative. We prove that $$d_r$$<\/jats:tex-math>\n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> satisfies the triangle inequality when $$\\rho$$<\/jats:tex-math>\n \u03c1<\/mml:mi>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> represents Pearson correlation, Spearman correlation, or Cosine similarity. We show $$d_r$$<\/jats:tex-math>\n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> to be better than $$d_s=\\sqrt{1-\\rho ^2}$$<\/jats:tex-math>\n \n \n d<\/mml:mi>\n s<\/mml:mi>\n <\/mml:msub>\n =<\/mml:mo>\n \n \n 1<\/mml:mn>\n -<\/mml:mo>\n \n \u03c1<\/mml:mi>\n 2<\/mml:mn>\n <\/mml:msup>\n <\/mml:mrow>\n <\/mml:msqrt>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>, another variant of $$d_a$$<\/jats:tex-math>\n \n d<\/mml:mi>\n a<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> that satisfies the triangle inequality, both analytically as well as experimentally. We empirically compared $$d_r$$<\/jats:tex-math>\n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> with $$d_a$$<\/jats:tex-math>\n \n d<\/mml:mi>\n a<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> in gene clustering and sample clustering experiment by real-world biological data. The two distances performed similarly in both gene clustering and sample clustering in hierarchical clustering and PAM (partitioning around medoids) clustering. However, $$d_r$$<\/jats:tex-math>\n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> demonstrated more robust clustering. According to the bootstrap experiment, $$d_r$$<\/jats:tex-math>\n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> generated more robust sample pair partition more frequently (P<\/jats:italic>-value $$<0.05$$<\/jats:tex-math>\n \n <<\/mml:mo>\n 0.05<\/mml:mn>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>). The statistics on the time a class \u201cdissolved\u201d also support the advantage of $$d_r$$<\/jats:tex-math>\n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> in robustness.<\/jats:p>\n <\/jats:sec>\n Conclusion<\/jats:title>\n $$d_r$$<\/jats:tex-math>\n \n d<\/mml:mi>\n r<\/mml:mi>\n <\/mml:msub>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>, as a variant of absolute correlation distance, satisfies the triangle inequality and is capable for more robust clustering.<\/jats:p>\n <\/jats:sec>","DOI":"10.1186\/s12859-023-05161-y","type":"journal-article","created":{"date-parts":[[2023,2,8]],"date-time":"2023-02-08T11:06:11Z","timestamp":1675854371000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["On triangle inequalities of correlation-based distances for gene expression profiles"],"prefix":"10.1186","volume":"24","author":[{"given":"Jiaxing","family":"Chen","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yen Kaow","family":"Ng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lu","family":"Lin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xianglilan","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuaicheng","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,2,8]]},"reference":[{"issue":"1","key":"5161_CR1","doi-asserted-by":"publisher","first-page":"220","DOI":"10.1186\/1471-2105-8-220","volume":"8","author":"J Hardin","year":"2007","unstructured":"Hardin J, Mitani A, Hicks L, VanKoten B. 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