• Markowitz portfolio theory can be applied to determine budget allocation in paid online search advertising. Risk-adjusted performance advertising improved through diversification negatively correlated keywords. Average keyword popularity growth estimated from Google Trends is strongly related the standard deviation of for each (R 2 = 74%) a sample data 15 major sectors. The proposed approach ...

Abstract With the prevalence of Internet access and online services, various big graphs are generated in many real applications (e.g., social networks knowledge graphs). An important task on analyzing mining these is keyword search. Essentially, given a graph G query Q associated with set keywords, search aims to find substructure rooted tree or subgraph) S such that nodes collectively cover pa...