The service, called Prism, allows clients to find the right stores for their brand, assess the likely effect on sales and even predict how often they need to visit the store to maximise return on investment.
Sharon Richey, Loewybe managing director, said: "Most evaluation of in-store activity simply measures results against targets and is only used to justify spend. What makes this model so revolutionary is that it enables that data to be used to maximise the effectiveness of future campaigns."
Also involved in the development of Prism are MBA students from the London Business School.
Bert de Reyck, associate professor at the school, said: "Prism uses sophisticated statistical tools and optimisation models. It provides Loewybe with an exciting opportunity to make a real breakthrough in a marketplace where modelling of this nature can make a significant difference to effectiveness of marketing investment."
Previous campaigns by Loewybe include work in the summer to promote Scottish Courage brands Fosters, Kronenbourg Blanc, John Smiths and Strongbow.
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