RETRACTED: Random effects model for estimating effectiveness of advertising in online marketplaces

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Editor-in-Chief.This article substantially reproduces parts an article published by the same authors that had already appeared in Expert Sys with Ap 38 (2011) Pages 4234–4243 (/http://dx.doi.org/10.1016/j.eswa.2010.09.090). One of the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.