In terms of design, it is a project that victordg can be proud of, but I notice a lack of domain knowledge [1] with respect to what charts portray and how they

In terms of design, it is a project that victordg can be proud of, but I notice a lack of domain knowledge [1] with respect to what charts portray and how they portray them; in very few situations could one infer bezier curves (or splines, or anything) from a set of data points. The result is more an "artist's conception of a chart" than a chart than an actual useful chart. I do quite like the mouseover data points, I realize these are pretty standard on online charts, but I think he did a good job on them. However, his chart's constraint on the time series -- really only a logistic progression is supported -- means that it essentially can only produce bar charts. I notice that it simply fails when data is missing from any table cell, which is probably an issue for any potential user; how does one then represent the absence of data? [1] Disclosure/DK-filter: I do not work with charts or tables of figures, and I don't know a great deal about the topic: I mention it because my understanding is that that false implication of continuity is a serious flaw in chart design.