Description
The algorithm creates a weighted, undirected document-to-document network based on the documents similarities from an ISI database.Menu Path
Extract -> From ISI Database -> Extract Weighted Document-Document Network
Input Parameters
Threshold
Any document-document edge whose calculated similarity is below this value will not be given an edge in the network output by this algorithm.
Comparison Algorithm
The comparison algorithm is used to calculate the similarity between documents. You may select between the following algorithms:
Name | Link to More Information | Theoretical Range of Values | Actual Range of Values for this Algorithm |
|---|---|---|---|
JaccardCoefficient | 0 to 1 | 0 to 1 | |
CosineSimilarity | -1 to 1 | 0 to 1 | |
SørensenSimilarityIndex | 0 to 1 | 0 to 1 |
Output
A network file with all documents connected by a weighted edge as calculated by the comparison algorithm if the weight of the was above the threshold value.
Usage Hints
The Cosine Similarity comparison algorithm does not preform any real comparison between the terms. It only uses the existence or nonexistence of a term in the set for the calculation.
Implementation Details
The Cosine Similarity comparison algorithm does not preform any real comparison between the terms. It only uses the existence or nonexistence of a term in the set for the calculation.
The network file has the following node properties
Label | Type | Source |
|---|---|---|
label | String | A concatenation of PUBLICATION_YEAR, VOLUME, DIGITAL_OBJECT_IDENTIFIER, BEGINNING_PAGE from the Documents Table, TWENTY_NINE_CHARACTER_SOURCE_TITLE_ABBREVIATION from the Sources Table, and RAW_NAME from the People Table. |
The network file has the following edge properties:
Label | Type | Source |
|---|---|---|
weight | float | The comparison algorithm chosen. |
DEFAULT_SOURCE_KEY | int | The node given to the edge. |
DEFAULT_TARGET_KEY | int | The node given to the edge. |
The specific query run by the tool can be found in the source code.