[MATH-1203] getKernel fails for buckets with only multiple instances of the same value in random.EmpiricalDistribution

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4, 3.4.1
• Fix Version/s: 4.0, 3.5
• Assignee: Unassigned
• Reporter: Kyle Kavanagh
• Created: 19/Feb/15 17:46
• Updated: 19/Jun/15 08:21
• Resolved: 14/Apr/15 12:18

Description

After loading a set of values into an EmpericalDistribution, assume that there's a case where a single bin ONLY contains multiple instances of the same value. In this case the standard deviation will equal zero. This will fail when getKernel attempts to create a NormalDistribution. The other case where stddev=0 is when there is only a single value in the bin, and this is handled by returning a ConstantRealDistribution rather than a NormalDistrbution.

See: https://issues.apache.org/jira/browse/MATH-984

Issue Links

• is duplicated by: MATH-1234 Impossible NotStrictlyPositiveException after getStandardDeviation()