RE: Model and sources of uncertainty

Need some help in understanding the difference between conflicting and
contradictory. Is it possible to view them on the same continuum?

---Vipul

> -----Original Message-----
> From: public-xg-urw3-request@w3.org [mailto:public-xg-urw3-request@w3.org]
> On Behalf Of Kathryn Blackmond Laskey
> Sent: Monday, June 18, 2007 7:53 AM
> To: Paulo CG Costa; public-xg-urw3@w3.org
> Subject: Re: Model and sources of uncertainty
> 
> 
> Paulo,
> 
> >Dissonance happens when you have distinct pieces of evidence
> >supporting contradictory or conflicting views.
> >If a given piece of evidence supports hypothesis H and another
> >supports hypothesis notH, then we have contradiction, since H and
> >notH are mutually exclusive.
> 
> EvidenceForH and EvidenceFornotH is not a contradiction! If we allow
> uncertainty, then EvidenceForH may be true when H is false, or
> EvidenceforNotH may be true when H is true.  That is, false negatives
> and false positives are possible.  They may be unlikely, but they are
> possible.
> 
> >A Knowledge Base that has two axioms  supporting contradictory
> >hypothesis is inconsistent.
> 
> No, that's not true.  A knowledge base that has two axioms that IMPLY
> contradictory hypotheses is inconsistent, but not a knowledge base
> with axioms that SUPPORT contradictory hypotheses. A knowledge base
> containing EvidenceForH and EvidenceFornotH is not necesssarily
> inconsistent (see above).
> 
> >Conflicting evidence is another form of dissonance, this time
> >supporting hypothesis that are not mutually exclusive.
> 
> That's not how I hvae always understood the term.  I thought conflict
> meant evidence that supported inconsistent hypotheses, such as when a
> witness says he saw the suspect at the scene of the crime, and
> another witness who says she saw the suspect miles away, both at the
> time when the crime was committed.
> 
> Kathy






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Received on Monday, 18 June 2007 16:17:17 UTC