#10770: Expectation of probability spaces is defined improperly
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Reporter: weigandt | Owner: weigandt
Type: defect | Status: new
Priority: minor | Milestone: sage-4.7
Component: misc | Keywords: Probability, Expectation
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by jason):
Maybe this is what you intended?
{{{
sage: P=frequency_distribution([1,1,1,2,2,2])
sage: P
Discrete probability space defined by {1: 0.500000000000000, 2:
0.500000000000000}
sage: X=DiscreteRandomVariable(P, {1:1, 2:2})
sage: X
Discrete random variable defined by {1: 1, 2: 2}
sage: X.expectation()
1.50000000000000
}}}
Maybe the confusion is that DiscreteProbabilitySpace inherits from
DiscreteRandomVariable (and so inherits the expectation method from
DiscreteRandomVariable)? Again, I'm not a statistician, so I'm not sure
what's natural.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10770#comment:2>
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