The sampling mechanism is used to approximate the resulting data, and show only a part of it. More information on it is available here:
Two special points deserve attention.
First, the mechanism used. The charting engine simply runs a calculation on all the data, and renders an average, based on the sampling threshold. As mentioned in the help topic, this does not take into account the positions where the points will be rendered. Thus, if the original data contains cluttered subsets with many points, the sampe may include them too.
The second point is the mode used in the sampling. This determines the value of the sample. For example, if you have 10 points, and choose "Min" as the SamplingFunction, the point with the smallest value will be used.
Another alternative to sampling is zooming and scrolling.
I hope this information helps.
the Telerik team
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