Informationswissenschaft at Universität Regensburg

Flashcards and summaries for Informationswissenschaft at the Universität Regensburg

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Exemplary flashcards for Informationswissenschaft at the Universität Regensburg on StudySmarter:

2 ways to visualize distributions

Exemplary flashcards for Informationswissenschaft at the Universität Regensburg on StudySmarter:

4 Ways to analyze distributions

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3 ways to organize collections for IR

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How does indexing work?

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How do term-document incidence matrices work?

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How does the indexer of the inverted index work?

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Quantitativer Aspekt von Informationen

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Qualtiativer Aspekt von Informationen

Exemplary flashcards for Informationswissenschaft at the Universität Regensburg on StudySmarter:

Unterschied Zeichenmenge/Zeichenvorrat

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Wahrscheinlichkeit von Zeichen

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Anzahl der Kodierungsmöglichkeiten berechnen

Exemplary flashcards for Informationswissenschaft at the Universität Regensburg on StudySmarter:

Entscheidungsfragen N

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Exemplary flashcards for Informationswissenschaft at the Universität Regensburg on StudySmarter:

Informationswissenschaft

2 ways to visualize distributions

  • Histogram
  • Boxplot

Informationswissenschaft

4 Ways to analyze distributions

  • Student's t-test
  • Fisher's exact test
  • Chi-square test
  • Mann-Whitney test

Informationswissenschaft

3 ways to organize collections for IR

  • Indexing
  • Term-Document incidence matrices
  • Inverted Index

Informationswissenschaft

How does indexing work?

  • Choose words that represent the content of the item
  • "tags" that describe tokens, can be searched

Problem:

Index that fits the item is hard to find

Informationswissenschaft

How do term-document incidence matrices work?

  • Build a matrix that consists of terms, document titles and 1/0 depending on wether the term is in the doc or not

Problem:

Matrix for big collections becomes too big

Informationswissenschaft

How does the indexer of the inverted index work?

  1. Sort list of titles(tokens) alphabetically
  2. Merge identical entries
  3. Split into dictionairy and posting list
  4. Add frequency information

Informationswissenschaft

Quantitativer Aspekt von Informationen

Übertragungsweise:

  • Effizienz
  • Effektivität (störungssicher)

Entropie/Informationsgehalt

Syntaktischer Aspekt 

  • Kodierung/Strukturierung der Zeichen

Informationswissenschaft

Qualtiativer Aspekt von Informationen

  • Semantischer Aspekt (Bedeutung von Zeichen/Worten)
  • Pragmatischer Aspekt (Bedeutung von Zeichen/Worten im Kontext)

Informationswissenschaft

Unterschied Zeichenmenge/Zeichenvorrat

Zeichenmenge = geordnet = alphabet

Informationswissenschaft

Wahrscheinlichkeit von Zeichen

Wahrscheinlichkeit, dass Zeichen aus Zeichenmenge ausgewählt wird

  • p = Anzahl p(a) / Menge M

Informationswissenschaft

Anzahl der Kodierungsmöglichkeiten berechnen

Zustand^Stellen

Informationswissenschaft

Entscheidungsfragen N

=Durschnittliche Anzahl der Ja/Nein Fragen zum bestimmein eines Ereignisses

  • N = ld (1/p)

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