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  re: Area under normal distribution
Posted by Ming on Feb-01-2013 04:03
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Hello Peter,

  I am using chart director in java , and I wonder if we have a function to shade the area under normal distribution?  I have searched but have not came upon one.

I really appreciate if you happen to know where i can look at.

Thanks so much in advance,

Ming

  re: Area under normal distribution
Posted by Peter Kwan on Feb-01-2013 23:54
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Hi Ming,

A normal distribution is a standard function. The points on the normal distribution can be obtained by looking up the normal distribution table. To plot a normal distribution curve, you just need to pick a few points (8 to 16 points is OK), and then use a spline curve to join them.

To fill the region under the curve, you may use an InterLineLayer to fill the region between the curve and the y=0 mark line (created using Axis.addMark). A simple example is at:

http://www.chartdir.com/forum/download_thread.php?bn=chartdir_support&thread=1257515780

Hope this can help.

Regards
Peter Kwan