{"42813":{"#nid":"42813","#data":{"type":"event","title":"Emulating Computer Simulators","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETITLE:\u003C\/strong\u003E Emulating Computer Simulators Using Compactly Supported Correlation Functions\n\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ESPEAKER:\u003C\/strong\u003E  Derek Bingham\n\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EABSTRACT:\u003C\/strong\u003E\n\u003C\/p\u003E\n\u003Cp\u003EStatistical emulators of computer simulators have proven to be useful in a variety of applications. However, a widely adopted model for building these emulators, using a Gaussian process distribution with strictly positive correlation function, can be computationally intractable when the number of evaluated input values is large. We propose a modi\u0026#64257;cation of this model that uses a combination of low-order regression terms and compactly supported correlation functions to recreate the desired predictive behavior of the simulator at a fraction of the computational cost. Following the usual approach of taking the correlation to be a product of correlations in each input dimension, we show how to impose restrictions on the range of each correlation, giving sparsity, while also allowing the ranges to trade o\u0026#64256; against one another in a data-adaptive way, thereby giving good predictive performance when the data are non-isotropic. We illustrate the method using data from a computer simulator of photometric red-shift.\n\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"Emulating Computer Simulators Using Compactly Supported Correlation Functions","format":"limited_html"}],"field_summary_sentence":[{"value":"Emulating Computer Simulators"}],"uid":"27187","created_gmt":"2009-10-12 20:36:08","changed_gmt":"2016-10-08 01:47:09","author":"Anita Race","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2009-03-31T12:00:00-04:00","event_time_end":"2009-03-31T13:00:00-04:00","event_time_end_last":"2009-03-31T13:00:00-04:00","gmt_time_start":"2009-03-31 16:00:00","gmt_time_end":"2009-03-31 17:00:00","gmt_time_end_last":"2009-03-31 17:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1242","name":"School of Industrial and Systems Engineering (ISYE)"}],"categories":[],"keywords":[{"id":"5304","name":"emulators"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cstrong\u003ENicoleta Serban\u003C\/strong\u003E\u003Cbr \/\u003EISyE\u003Cbr \/\u003E\u003Ca href=\u0022mailto:nserban@isye.gatech.edu\u0022\u003EContact Nicoleta Serban\u003C\/a\u003E\u003Cbr \/\u003E\u003Cstrong\u003E404-385-7255\u003C\/strong\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}