lsa: Latent Semantic Analysis

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The basic idea of latent semantic analysis (LSA) is, that text do have a higher order (=latent semantic) structure which, however, is obscured by word usage (e.g. through the use of synonyms or polysemy). By using conceptual indices that are derived statistically via a truncated singular value decomposition (a two-mode factor analysis) over a given document-term matrix, this variability problem can be overcome.

Author
Fridolin Wild
Date of publication
2015-05-08 19:58:09
Maintainer
Fridolin Wild <f.wild@open.ac.uk>
License
GPL (>= 2)
Version
0.73.1

View on CRAN

Man pages

alnumx
Regular expression for removal of non-alphanumeric characters...
associate
Find close terms in a textmatrix
as.textmatrix
Display a latent semantic space generated by Latent Semantic...
corpora
Corpora (Essay Scoring)
cosine
Cosine Measure (Matrices)
dimcalc
Dimensionality Calculation Routines (LSA)
foldin
Ex-post folding-in of textmatrices into an existing latent...
lsa
Create a vector space with Latent Semantic Analysis (LSA)
print.textmatrix
Print a textmatrix (Matrices)
query
Query (Matrices)
sample.textmatrix
Create a random sample of files
specialchars
List of special character html entities and their character...
stopwords
Stopwordlists in German, English, Dutch, French, Polish, and...
summary.textmatrix
Summary of a textmatrix (Matrices)
textmatrix
Textmatrix (Matrices)
triples
Bind Triples to a Textmatrix
weightings
Weighting Schemes (Matrices)

Files in this package

lsa
lsa/tests
lsa/tests/lsa-tests.R
lsa/tests/polski.RData
lsa/NAMESPACE
lsa/demo
lsa/demo/lsa_landauer.R
lsa/demo/lsa_plot.R
lsa/demo/00Index
lsa/demo/lsa_essayscoring.R
lsa/data
lsa/data/corpus_scores.rda
lsa/data/specialchars.rda
lsa/data/stopwords_pl.rda
lsa/data/stopwords_ar.rda
lsa/data/stopwords_nl.rda
lsa/data/stopwords_en.rda
lsa/data/stopwords_de.rda
lsa/data/corpus_training.rda
lsa/data/corpus_essays.rda
lsa/data/alnumx.rda
lsa/data/stopwords_fr.rda
lsa/R
lsa/R/associate.R
lsa/R/cosine.R
lsa/R/query.R
lsa/R/weightings.R
lsa/R/triples.R
lsa/R/textmatrix.R
lsa/R/dimcalc.R
lsa/R/sample.textmatrix.R
lsa/R/lsa.R
lsa/MD5
lsa/DESCRIPTION
lsa/ChangeLog
lsa/man
lsa/man/textmatrix.Rd
lsa/man/summary.textmatrix.Rd
lsa/man/specialchars.Rd
lsa/man/associate.Rd
lsa/man/cosine.Rd
lsa/man/corpora.Rd
lsa/man/print.textmatrix.Rd
lsa/man/triples.Rd
lsa/man/weightings.Rd
lsa/man/sample.textmatrix.Rd
lsa/man/lsa.Rd
lsa/man/as.textmatrix.Rd
lsa/man/query.Rd
lsa/man/dimcalc.Rd
lsa/man/foldin.Rd
lsa/man/alnumx.Rd
lsa/man/stopwords.Rd