{"id":416,"date":"2021-09-24T12:36:14","date_gmt":"2021-09-24T11:36:14","guid":{"rendered":"https:\/\/blogg.lnu.se\/disa\/?p=416"},"modified":"2021-10-04T11:44:39","modified_gmt":"2021-10-04T10:44:39","slug":"disa-seminar-october-4th-on-aggregation-as-unsupervised-learning-and-some-of-its-applications","status":"publish","type":"post","link":"https:\/\/blogg.lnu.se\/disa\/?p=416","title":{"rendered":"DISA Seminar October 4th on Aggregation as Unsupervised Learning and some of its Applications"},"content":{"rendered":"<ul>\n<li><strong>When?<\/strong> October 4th 12-13<\/li>\n<li><strong>Where?<\/strong> Online &#8211; the link will be sent to those who sign up<\/li>\n<li><strong>Registration?<\/strong> Sign up via this <a href=\"https:\/\/forms.gle\/GBc3VgsonGDiy9BV7\" target=\"_blank\" rel=\"noopener\">link<\/a>\u00a0no later than October 3rd.<\/li>\n<\/ul>\n<p>This seminar will be presented by the <a href=\"https:\/\/lnu.se\/en\/\/dista\/\" target=\"_blank\" rel=\"noopener\">DISTA<\/a> research group within DISA, you will meet and listen to Welf L\u00f6we, Maria Ulan, Morgan Ericsson, Anna Wingkvist<\/p>\n<p>Aggregation combines several independent variables to a dependent variable. The independent variables are different, possible mutually dependent observations of a real world. The dependent variable should preserve properties of the independent variables, e.g., the ranking or relative distance of the independent variable tuples, and ultimately the properties of the real world. However, while there usually exist large amounts independent variable tuples, there is no ground truth data available mapping these tuples to the corresponding dependent variable values. This makes aggregation an unsupervised machine learning problem, as opposed to, e.g., regression where data comprises independent variable tuples and the corresponding dependent variable values.<\/p>\n<p>Instances of the problem frequently occur in software engineering, e.g., when trying to assess the quality of software by metrics. Metrics (independent variables) can easily be measured for a lot of software artifacts, but it is hard to measure quality (dependent variable). Instances also occur in many other assessment situations including, but not limited to the assessment of project proposals, financial investments, and human movements.<\/p>\n<p>In our talk, we present<br \/>\n1) aggregation as unsupervised learning including unweighted and weighted approaches<br \/>\n2) ways to evaluate and compare different aggregation approaches including an evaluation of the approaches introduced in 1)<br \/>\n3) applications to software engineering problems applying the evaluation introduce in 2)<\/p>\n<p>The recording of this session and previous recordings will be available at the following <a href=\"https:\/\/play.lnu.se\/channel\/DISA%2BSeminars\/457152\">link<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When? October 4th 12-13 Where? Online &#8211; the link will be sent to those who sign up Registration? Sign up via this link\u00a0no later than October 3rd. This seminar will be presented by the DISTA research group within DISA, you will meet and listen to Welf L\u00f6we, Maria Ulan, Morgan Ericsson, Anna Wingkvist Aggregation combines [&hellip;]<\/p>\n","protected":false},"author":401,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93],"tags":[],"class_list":["post-416","post","type-post","status-publish","format-standard","hentry","category-blogg"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>DISA Seminar October 4th on Aggregation as Unsupervised Learning and some of its Applications - DISA<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/blogg.lnu.se\/disa\/?p=416\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"DISA Seminar October 4th on Aggregation as Unsupervised Learning and some of its Applications - DISA\" \/>\r\n<meta property=\"og:description\" content=\"When? October 4th 12-13 Where? Online &#8211; the link will be sent to those who sign up Registration? Sign up via this link\u00a0no later than October 3rd. This seminar will be presented by the DISTA research group within DISA, you will meet and listen to Welf L\u00f6we, Maria Ulan, Morgan Ericsson, Anna Wingkvist Aggregation combines [&hellip;]\" \/>\r\n<meta property=\"og:url\" content=\"https:\/\/blogg.lnu.se\/disa\/?p=416\" \/>\r\n<meta property=\"og:site_name\" content=\"DISA\" \/>\r\n<meta property=\"article:published_time\" content=\"2021-09-24T11:36:14+00:00\" \/>\r\n<meta property=\"article:modified_time\" content=\"2021-10-04T10:44:39+00:00\" \/>\r\n<meta name=\"author\" content=\"Diana Unander\" \/>\r\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\r\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Diana Unander\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\r\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogg.lnu.se\/disa\/?p=416\",\"url\":\"https:\/\/blogg.lnu.se\/disa\/?p=416\",\"name\":\"DISA Seminar October 4th on Aggregation as Unsupervised Learning and some of its Applications - DISA\",\"isPartOf\":{\"@id\":\"https:\/\/blogg.lnu.se\/disa\/#website\"},\"datePublished\":\"2021-09-24T11:36:14+00:00\",\"dateModified\":\"2021-10-04T10:44:39+00:00\",\"author\":{\"@id\":\"https:\/\/blogg.lnu.se\/disa\/#\/schema\/person\/a322baa56840d8b8d7320bc36fc73c42\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogg.lnu.se\/disa\/?p=416\"]}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogg.lnu.se\/disa\/#website\",\"url\":\"https:\/\/blogg.lnu.se\/disa\/\",\"name\":\"DISA\",\"description\":\"Centre for Data Intensive Sciences and Applications\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blogg.lnu.se\/disa\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/blogg.lnu.se\/disa\/#\/schema\/person\/a322baa56840d8b8d7320bc36fc73c42\",\"name\":\"Diana Unander\",\"sameAs\":[\"https:\/\/lnu.se\/en\/disa\"],\"url\":\"https:\/\/blogg.lnu.se\/disa\/?author=401\"}]}<\/script>\r\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"DISA Seminar October 4th on Aggregation as Unsupervised Learning and some of its Applications - DISA","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blogg.lnu.se\/disa\/?p=416","og_locale":"en_US","og_type":"article","og_title":"DISA Seminar October 4th on Aggregation as Unsupervised Learning and some of its Applications - DISA","og_description":"When? 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