{"id":167056,"date":"2014-08-01T00:00:00","date_gmt":"2014-08-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/distance-queries-from-sampled-data-accurate-and-efficient\/"},"modified":"2018-10-16T21:21:01","modified_gmt":"2018-10-17T04:21:01","slug":"distance-queries-from-sampled-data-accurate-and-efficient","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/distance-queries-from-sampled-data-accurate-and-efficient\/","title":{"rendered":"Distance Queries from Sampled Data: Accurate and Efficient"},"content":{"rendered":"<div class=\"asset-content\">\n<p>Distance queries are a basic tool in data analysis.  They are used for detection and localization of change for the purpose of anomaly detection, monitoring, or planning.  Distance queries are particularly useful when data sets such as measurements, snapshots of a system, content, traffic matrices, and activity logs are collected repeatedly.<\/p>\n<p>Random sampling, which can be efficiently performed over streamed or distributed data, is an important tool for scalable data analysis. The sample constitutes an extremely flexible summary, which naturally supports domain queries and scalable estimation of statistics, which can be specified after the sample is generated.  The effectiveness of a sample as a summary, however, hinges on the estimators we have. <\/p>\n<p>We derive novel estimators for estimating L_p distance from sampled data.  Our estimators apply with the most common weighted sampling schemes: Poisson Probability Proportional to Size (PPS) and its fixed sample size variants.  They also apply when the samples of different data sets are independent or coordinated.  Our estimators are admissible (Pareto optimal in terms of variance) and have compelling properties.  <\/p>\n<p>We study the performance of our Manhattan and Euclidean distance (p=1,2) estimators on diverse datasets, demonstrating  scalability and accuracy even when a small fraction of the data is sampled. Our work, for the first time, facilitates effective distance estimation over sampled data.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Distance queries are a basic tool in data analysis. They are used for detection and localization of change for the purpose of anomaly detection, monitoring, or planning. Distance queries are particularly useful when data sets such as measurements, snapshots of a system, content, traffic matrices, and activity logs are collected repeatedly. Random sampling, which can [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"user_nicename","value":"editco"}],"msr_publishername":"ACM - Association for Computing Machinery","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"MSR-TR-2014-111","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"\u00a9 ACM. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. 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