Bump! I concur with the other commenters. Having error bar capabilities would be incredibly useful in many contexts.
jQplot is a great product. Any plans for implementing error bars?
Many plots can be misleading without error bars. Without them, jQplot is useful for displaying counts of things, but for calculated or measured data it suffers for want of error bars. Many areas of business are becoming increasingly quantified with scientific methods used. Don't assume error bars are only for scientists and engineers. I've been advocating jQplot over R in our company, only to run into this issue. I've never heard of a plot package without error bars, so I assumed you had them.
What I'd like is for each point to have it's own error value in the same units as the data, from which an error bar is generated with appropriate length above and below. Having separate high and low values and other options would be useful as Miquel suggested. Treating the errors similar to how you supply tick labels for the x-axis would be convenient.
I've invested a bit in jQplot already, so I'll give it a good college try to hack in error bars into the other renders I use (not OHLC). At this point, I know absolutely nothing about the code (except for the above!) is this a good place for feedback?
just in case you don't know, the lineRenderer supports error bars and confidence intervals as a band.
See examples/bandedLine.html in the source distribution.
It's nowhere on the website so I also only found it by chance.
I've also been using jqplot and ran into the error bar issue. Seeing as I only use bar charts at the moment, I modified the barRenderer plugin to overlay error bars. So if you need error bars on bar charts, feel free to use my modified version: