- From: Ken Laskey <klaskey@mitre.org>
- Date: Wed, 18 Jul 2007 08:09:31 -0400
- To: Peter.Vojtas@mff.cuni.cz
- Cc: public-xg-urw3@w3.org
Peter, Again the question is what is the purpose of our uncertainty ontology. I believe the properties you propose may be important as part of our conclusions of what information an _instance_ must eventually convey, but is it necessary in our ontology if we are using that as a guide for classifying descriptive aspects of uncertainty? As I note in an email I just sent on criteria for proposing OWL extensions, examples of how something would be used are encouraged. Ken On Jul 18, 2007, at 7:55 AM, Peter Vojtas wrote: > > Ken, what do think about the possibility to solve this in our ontology > as it is now by using hasDerivation property and UncertaintyDerivation > class should go into details, how it was obtained (e.g. whether > methods used agree with the model), from which data and knowledge ... > Peter > > Ken Laskey wrote: >> Again, I think this implies that a probability value alone is >> insufficient because you need to know something about how the value >> was assigned before you can combine it with other probabilities, >> i.e. values that may derive from inconsistent approaches. >> Ken >> On Jul 18, 2007, at 6:50 AM, Mitch Kokar wrote: >>> This is a good point. So in one of my previous emails I suggested >>> that we >>> have "complex sentences", i.e., sentences consisting of multiple >>> sentences. >>> Then each sentence could have uncertainty assigned to it. I still >>> think an >>> "elementary sentence" could be assigned a probability. For complex >>> sentences >>> we could have probabilities for the sentences that are "part of" the >>> sentence, as well as the overall probability for the complex >>> sentence. This >>> would provide the flexibility that you are asking for, right? >>> >>> ==Mitch >>> >>> >>> >>>> -----Original Message----- >>>> From: public-xg-urw3-request@w3.org >>>> [mailto:public-xg-urw3-request@w3.org] On Behalf Of >>>> Kathryn Blackmond Laskey >>>> Sent: Tuesday, July 17, 2007 11:31 PM >>>> To: Ken Laskey; Peter.Vojtas@mff.cuni.cz >>>> Cc: public-xg-urw3@w3.org >>>> Subject: Re: [URW3 public] Re: [URW3] ... three questions >>>> based on the last telecon >>>> >>>> >>>>>> What the sentence is about is important for our decision about >>>>>> uncertainty assignment - e.g. if I know a contradicting >>>> >>>> information, >>>> >>>>>> or a consequence from a trusted site, it will influence >>>> >>>> my uncertainty >>>> >>>>>> assignment. >>>>>> Uncertainty about the weather is no more uncertain when >>>> >>>> the tome is >>>> >>>>>> gone >>>>> >>>>> >>>>> So it appears that I may need to convey information on >>>> >>>> what influenced >>>> >>>>> my uncertainty assignment. Note, this is not saying I need to >>>>> represent what the sentence is about but rather I may >>>> >>>> need to point to >>>> >>>>> the mechanisms that were developed by "other communities" >>>> >>>> and that I am >>>> >>>>> using as the (or a) basis of my assessment. >>>> >>>> >>>> I note here that probability is not truth-functional. >>>> That is, if I know the probability of A and the >>>> probability of B, I don't necessarily know the probability >>>> of A-and-B. This is a very important characteristic of >>>> probability. It is a source of great power, and it is also >>>> the reason straightforward attempts to do uncertainty >>>> propagation by attaching "certainty factors" to >>>> propositions and rules works only in very constrained >>>> problems. This is important for us, because annotating >>>> sentences with uncertainty values isn't going to work for >>>> many interesting problems. >>>> >>>> Kathy >>>> >>>> >>> >>> >>> >> ---------------------------------------------------------------------- >> -- ----- >> Ken Laskey >> MITRE Corporation, M/S H305 phone: 703-983-7934 >> 7151 Colshire Drive fax: 703-983-1379 >> McLean VA 22102-7508 > > > ------------------------------------------------------------------------ ----- Ken Laskey MITRE Corporation, M/S H305 phone: 703-983-7934 7151 Colshire Drive fax: 703-983-1379 McLean VA 22102-7508
Received on Wednesday, 18 July 2007 12:09:09 UTC