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X-WR-CALDESC:Events for CREST
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DTSTART:20190331T010000
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DTSTART:20191027T010000
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DTSTART;TZID=Europe/Helsinki:20190527T110000
DTEND;TZID=Europe/Helsinki:20190527T120000
DTSTAMP:20260822T073007
CREATED:20190524T103143Z
LAST-MODIFIED:20190524T103143Z
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SUMMARY:Rémi Avignon - "Buying Groups and Product Variety"
DESCRIPTION:CREST Internal Seminar in Microeconomics :  \n\nTime: 11:00 am – 12:00pm\nDate: 27th May 2019\nPlace: Room 3105.\n Rémi Avignon – “Buying Groups and Product Variety” \nAbstract: \nWe study the impact of retailers’ buying groups on both product variety and the profit sharing within the vertical chain. We consider a setting in which capacity constrained retailers operate in separated markets and must select their assortment among a set of differentiated products. Retailers may either adopt an independent listing strategy or a joint listing strategy (i.e they commit to listing the same product assortment) which may cover the whole product line (full coverage) or only part of it (partial coverage). We show that retailers may enhance their buyer power by jointly committing to a common listing strategy. As a result\, buying groups reduce the overall product variety. This results in lower overall consumer surplus. Interestingly buying groups with partial coverage may be more profitable for the retailers than those with full coverage.\n \n\nOrganizers:\nAlexis Larousse (CREST)\nSponsors:\nCREST\nLunch registration:\nno registration needed\n\n  \n
URL:https://crest.science/event/remi-avignon-buying-groups-and-product-variety/
LOCATION:3105
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DTSTART;TZID=Europe/Paris:20190527T140000
DTEND;TZID=Europe/Paris:20190527T151500
DTSTAMP:20260822T073007
CREATED:20190315T131105Z
LAST-MODIFIED:20190315T131105Z
UID:12232-1558965600-1558970100@crest.science
SUMMARY:Geoffrey CHINOT (CREST) - "ERM and RERM are tractable and optimal estimators in the ε-contamination model"
DESCRIPTION:\nThe Statistical Seminar: Every Monday at 2:00 pm.\nTime: 2:00 pm – 3:15 pm\nDate: 27 th of May 2019\nPlace: Room 3001.\nGeoffrey CHINOT (CREST) – “ERM and RERM are tractable and optimal estimators in the ε-contamination model” \nAbstract: We study the ERM and RERM with Lipschitz and convex loss functions under a subgaussian assumption on the design. We consider a setting where |O| outliers may contaminate the labels. In that case\, we show that the error rate is bounded by r(N) + |O|/N\, where N is the total number of observations and r(N) is the optimal error rate in the non-contaminated setting. The main result can be used for both non-regularized and regularized procedures. For instance we present results for the Huber’s M-estimators without penalization or regularized by the l1-norm. For these two applications we get minimax-optimal rates in the ε- contamination model. \n \nOrganizers:\nCristina BUTUCEA\, Alexandre TSYBAKOV\, Julie JOSSE\, Eric MOULINES\, Mathieu ROSENBAUM\nSponsors:\nCREST-CMAP\n \n\n
URL:https://crest.science/event/geoffrey-chinot-crest/
CATEGORIES:Statistics
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