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What is the best way to describe latency?

What are good ways of describe observed tick data latency with a view to flagging when something is systematically wrong? For example, we would want to discount outlier ticks so that we do not alert ...
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Has automated trading produced profits at IEX?

Is there evidence that automated trading is profitable on the latency-enforced portion of the exchange? On the one hand, if automated trading was profitable when these limits existed naturally, it ...