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Does anyone know of a (free) JS graph library that allows for data at irregular intervals?

I'm looking for something like this, but with a more permissive license: http://www.highcharts.com/demo/spline-irregular-time

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If I may propose my own solution [0]. It has no dependencies and is quite interactive for analysis (regression, measurements, and predictions). However not very customisable and lacks a good method for handling date/time data.

[0] http://www.lancaster.ac.uk/pg/sarsby/MJSplot/index

Maybe http://metricsgraphicsjs.org/ could help you with this.

Hrm, one of the requirements that I forgot to mention (but might be implied by the example?) is that the are 4 different data sets on the graph, all with different different intervals.

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