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The second thing you absolutely need is a client profitability model.
But most attempts to introduce a new model fail.
As an extension of the three-factor model, Fama and French (2015) introduced a five-factor model, adding profitability and investment factors: Eleft {R}_iright kern0.5em -kern0.5em {b}_ikeRMRFkern0.5em0.5em {s}_iE SMB kern0.5em+kern0.5em {h}_iE HML kern0.5em +kern0.5em {r}_iE RMW kern0.5em +kern0.5em {c}_iE CMA)kern0.5em +kern0.5em {c}_iE CMA).
The company also introduced a new model.
A16z introduced a new model: the venture company.
Back in August 2013, the company introduced a freemium model.
Profitability models most likely reside in Excel.
Stanford Graduate School of Business has introduced a new, online model for executive learning.
Dynamic Modeling introduces an approach to modeling that makes it a more practical, intuitive endeavor.
Ralph Carver, of Los Angeles introduced a number of models.
This model could introduce a new layer of complexity to a complex model".
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com