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| help:lists [2010/06/02 17:41] – created eros | help:lists [2012/02/17 19:54] – eros |
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| ====== Whitelists and blacklists ====== | ====== Blacklists and whitelists ====== |
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| ==== Blacklists ==== | ==== Blacklists ==== |
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| A blacklist is a list of "bad" words (e.g., pornographic terms). If a document contains more than a certain number of types or tokens from this list, it will be discarded. | A blacklist is a list of "bad" words (e.g., pornographic terms). If a document contains more than a certain number of [[http://en.wikipedia.org/wiki/Type-token_distinction|types]] or [[http://en.wikipedia.org/wiki/Token_(parser)#Token|tokens]] from this list, it will be discarded. |
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| The "Types" and "Tokens" parameters let you specify the number of types and tokens from the "bad" word list sufficient to cause a document to be discarded. | The "Types" and "Tokens" parameters let you specify the number of types and tokens from the "bad" word list sufficient to cause a document to be discarded. |
| ==== Whitelists ==== | ==== Whitelists ==== |
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| A whitelist is a list of "good" words (e.g., function words). A document is included in the corpus only if it contains a certain number of types and tokens from this list, and if the ratio of tokens from the list to total tokens is above a certain threshold. | A whitelist is a list of "good" words (e.g., function words). A document is included in the corpus only if it contains a certain number of [[http://en.wikipedia.org/wiki/Type-token_distinction|types]] and [[http://en.wikipedia.org/wiki/Token_(parser)#Token|tokens]] from this list, and if the ratio of tokens from the list to total tokens is above a certain threshold. |
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| The "Types", "Tokens" and "Ratio" parameters let you specify the minimum number of types and tokens from the whitelist that a document must contain to be included, and the minimum ratio of tokens from the list to total tokens in the document that a document must have to be included. | The "Types", "Tokens" and "Ratio" parameters let you specify the minimum number of types and tokens from the whitelist that a document must contain to be included, and the minimum ratio of tokens from the list to total tokens in the document that a document must have to be included. |