How Can You Tell a Manager Is Working?

It's been a very short time since Steven Gerrard, Antonio Conte and Eddie Howe took over their new clubs. It's been even less time since Ole Gunnar Solskjaer left United and Ralf Rangnick took over. There are early indications of potentially significant managerial effects in the numbers of Spurs and Villa, and less so at Newcastle. What does this mean? How do we look at performance and tactical indicators in very small samples when evaluating clubs and managers?

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