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Tree Matrix tree survival scores are powered by our Predictive Analytical Engine (PAE) an algorithm developed by Keith Pitchford, with his 30 years of consulting on arboriculture and tree preservation projects. The PAE grew from a frustration with subjective, guesswork-type tree preservation. This “old school” method of guesswork has now been replaced with a highly accurate formula that will help to eliminate uncertainty in this process. This will result in the retention of more trees with fewer uncertainties and legal challenges.