Informationswissenschaft at Universität Regensburg

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2 ways to visualize distributions

Histogram
Boxplot

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4 Ways to analyze distributions

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

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3 ways to organize collections for IR

Indexing
Term-Document incidence matrices
Inverted Index

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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

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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

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How does the indexer of the inverted index work?

Sort list of titles(tokens) alphabetically
Merge identical entries
Split into dictionairy and posting list
Add frequency information

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Quantitativer Aspekt von Informationen

Übertragungsweise:

Effizienz
Effektivität (störungssicher)

Entropie/Informationsgehalt

Syntaktischer Aspekt

Kodierung/Strukturierung der Zeichen

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Qualtiativer Aspekt von Informationen

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

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Unterschied Zeichenmenge/Zeichenvorrat

Zeichenmenge = geordnet = alphabet

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Wahrscheinlichkeit von Zeichen

Wahrscheinlichkeit, dass Zeichen aus Zeichenmenge ausgewählt wird

p = Anzahl p(a) / Menge M

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Anzahl der Kodierungsmöglichkeiten berechnen

Zustand^Stellen

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Entscheidungsfragen N

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

N = ld (1/p)

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Informationswissenschaft at Universität Regensburg

Flashcards and summaries for Informationswissenschaft at the Universität Regensburg

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