A problem frequently encountered with displaying multiple series with overlapping data points within a single line chart is that they just seem to entangle themselves. To get an idea of all the data point that a series represents, the user has to either mentally segregate it from the rest or click on it to highlight the particular line. The NY Times recently published a chart How This Bear Market Compares that tries to solve this problem by highlighting a series on mouseover so that it stands out from the others. A floating text provides the description of the event.
Over the weekend, it tried to replicate this chart. Jon (MVP and Excel chart expert) in one of his posts described how to use Chart Events to highlight a series. I took the code he had written and modified that to achieve the series mouseover effect with a pseudo tooltip.
So how does this bear market compare to the NY Times? Well……almost there.