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Increasing ad spend isn't increasing conversions. Verify that frustration without writing functions
What you will learn in this article・How to find out which of ad spend, visits, inquiries, or conversions is having an effect ...
X ij = [x ij1, ... , x ijp]' The Generalized Estimating Equation of Liang and Zeger (1986) for estimating the p ×1 vector of regression parameters is an extension of the independence estimating ...
Harry Markowitz famously quipped that diversification is the only free lunch in investing. What he did not say is that this is only true if correlations are known and stable over time. Markowitz’s ...
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