Trend analysis in my experience is generally done through manual (human) review and exploration of data through various BI tools, these tools do a great job by visually highlighting data that can be of interest to the data analyst, and when coupled with data-mining techniques such as clustering and forecasting, it gives us invaluable and actionable information that can help us further explore and exploit the business or data model at hand. As far as I can tell, the name of the game these days is “exploratory data analysis and mining”, at least in terms of Business Intelligence products on the market and the direction they are taking.

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