Existentially closed model - Revision history

132.65.153.96: /* Definition */

2014-05-16T12:37:51Z

Definition

← Older revision		Revision as of 14:37, 16 May 2014
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	~~{{Refimprove\|date=June 2007}}~~		Golda is what's written on my birth certificate even though it is not the name on my birth certification. Invoicing is what I do. For years he's been residing in Mississippi and he doesn't strategy on altering it. To climb is some thing I truly enjoy performing.<br><br>Feel free to surf to my site; [http://cpacs.org/index.php?document_srl=90091&mid=board_zTGg26 love psychics]
	~~'''Mean reciprocal rank''~~' is ~~a [[statistic]] measure for evaluating any process that produces a list of possible responses to a sample of queries, ordered by probability of correctness~~. ~~The reciprocal rank of a query response~~ is ~~the [[multiplicative inverse]] of the rank of the first correct answer~~. ~~The mean reciprocal rank~~ is the average of the reciprocal ranks of results for a sample of queries Q:<ref>{{cite conference \| title=Proceedings of the 8th Text Retrieval Conference \| booktitle=TREC-8 Question Answering Track Report \| author=E.M. ~~Voorhees \|year=1999 \| pages=77–82}}~~<~~/ref~~>

	:<~~math~~> ~~\text{MRR} = \frac{1}{\|Q\|} \sum_{i=1}^{\|Q\|} \frac{1}{\text{rank}_i}. \!</math>~~

	~~The reciprocal value of the mean reciprocal rank corresponds~~ to ~~the [~~[~~harmonic mean]] of the ranks.~~

	~~== Example ==~~
	For example, suppose we have the following three sample queries for a system that tries to translate English words to their plurals. In each case, the system makes three guesses, with the first one being the one it thinks is most likely correct:

	~~{\| class="wikitable"~~
	\|-
	~~! Query~~
	~~! Results~~
	~~! Correct response~~
	~~! Rank~~
	~~! Reciprocal rank~~
	\|-
	~~\| cat~~
	~~\| catten, cati, '''cats'''~~
	~~\| cats~~
	~~\| 3~~
	~~\| 1~~/3
	\|-
	~~\| torus~~
	~~\| torii, '''tori''', toruses~~
	~~\| tori~~
	~~\| 2~~
	~~\| 1~~/2
	\|-
	~~\| virus~~
	~~\| '''viruses''', virii, viri~~
	~~\| viruses~~
	~~\| 1~~
	~~\| 1~~
	\|}

	~~Given those three samples, we could calculate the mean reciprocal rank as (1~~/~~3 + 1/2 + 1)/3 = 11/18 or about 0.61.~~

	~~This basic definition does not specify what to do if...~~
	~~# none of the proposed results are correct (use mean reciprocal rank 0), or if~~
	~~# there are multiple correct answers in the list~~. ~~Consider using [[Information_retrieval#Mean_average_precision\|mean average precision (MAP)]].~~

	~~See also [[Information retrieval]] and [[Question answering]].<ref>{{cite conference \| title~~=~~Evaluating web-based question answering systems \| booktitle=Proceedings of LREC \| author~~=~~D. R. Radev, H. Qi, H. Wu, W. Fan \|year=2002 }}</ref>~~

	~~==References==~~
	~~{{Reflist}}~~

	~~[[Category:Summary statistics]]~~
	~~[[Category:Information retrieval]~~]

en>MaximalIdeal: linking to Chen Chung Chang's page

2013-12-10T20:06:40Z

linking to Chen Chung Chang's page

← Older revision		Revision as of 22:06, 10 December 2013
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	~~Hello~~, ~~my name~~ is ~~Andrew and my spouse doesn't like it at all~~. ~~Ohio~~ is ~~where her house is. My spouse doesn't like it~~ the ~~way I do but what I really like doing is caving but I don't have~~ the ~~time recently~~. ~~He functions as a bookkeeper~~.<br><br>~~Feel free~~ to ~~visit my web~~-~~site accurate psychic predictions~~ (~~[http:~~//1.~~234~~.36.~~240~~/~~fxac/m001_2/7330 visit this website~~])		{{Refimprove\|date=June 2007}}
			'''Mean reciprocal rank''' is a [[statistic]] measure for evaluating any process that produces a list of possible responses to a sample of queries, ordered by probability of correctness. The reciprocal rank of a query response is the [[multiplicative inverse]] of the rank of the first correct answer. The mean reciprocal rank is the average of the reciprocal ranks of results for a sample of queries Q:<ref>{{cite conference \| title=Proceedings of the 8th Text Retrieval Conference \| booktitle=TREC-8 Question Answering Track Report \| author=E.M. Voorhees \|year=1999 \| pages=77–82}}</ref>

			:<math> \text{MRR} = \frac{1}{\|Q\|} \sum_{i=1}^{\|Q\|} \frac{1}{\text{rank}_i}. \!</math>

			The reciprocal value of the mean reciprocal rank corresponds to the [[harmonic mean]] of the ranks.

			== Example ==
			For example, suppose we have the following three sample queries for a system that tries to translate English words to their plurals. In each case, the system makes three guesses, with the first one being the one it thinks is most likely correct:

			{\| class="wikitable"
			\|-
			! Query
			! Results
			! Correct response
			! Rank
			! Reciprocal rank
			\|-
			\| cat
			\| catten, cati, '''cats'''
			\| cats
			\| 3
			\| 1/3
			\|-
			\| torus
			\| torii, '''tori''', toruses
			\| tori
			\| 2
			\| 1/2
			\|-
			\| virus
			\| '''viruses''', virii, viri
			\| viruses
			\| 1
			\| 1
			\|}

			Given those three samples, we could calculate the mean reciprocal rank as (1/3 + 1/2 + 1)/3 = 11/18 or about 0.61.

			This basic definition does not specify what to do if...
			# none of the proposed results are correct (use mean reciprocal rank 0), or if
			# there are multiple correct answers in the list. Consider using [[Information_retrieval#Mean_average_precision\|mean average precision (MAP)]].

			See also [[Information retrieval]] and [[Question answering]].<ref>{{cite conference \| title=Evaluating web-based question answering systems \| booktitle=Proceedings of LREC \| author=D. R. Radev, H. Qi, H. Wu, W. Fan \|year=2002 }}</ref>

			==References==
			{{Reflist}}

			[[Category:Summary statistics]]
			[[Category:Information retrieval]]

en>Gergely.Szekely at 05:43, 16 August 2011

2011-08-16T05:43:11Z

New page

Hello, my name is Andrew and my spouse doesn't like it at all. Ohio is where her house is. My spouse doesn't like it the way I do but what I really like doing is caving but I don't have the time recently. He functions as a bookkeeper.<br><br>Feel free to visit my web-site accurate psychic predictions ([http://1.234.36.240/fxac/m001_2/7330 visit this website])