Update README.md

README.md

@@ -47,10 +47,27 @@ Dataset is composed by six corpora:
 
 ## Data Collection and Processing
 
-<!-- This section describes the data collection and processing process such as data selection criteria, filtering and normalization methods, tools and libraries used, etc. -->
-
-[More Information Needed]
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+LegalPT is deduplicated using [MinHash algorithm](https://dl.acm.org/doi/abs/10.5555/647819.736184) and [Locality Sensitive Hashing](https://dspace.mit.edu/bitstream/handle/1721.1/134231/v008a014.pdf?sequence=2&isAllowed=y), following the approach of [Lee et al. (2022)](http://arxiv.org/abs/2107.06499).
+
+We used 5-grams and a signature of size 256, considering two documents to be identical if their Jaccard Similarity exceeded 0.7.
+
+Duplicate rate found by the Minhash-LSH algorithm  for the LegalPT corpus:
+
+| **Corpus**               |  **Documents** | **Docs. after deduplication** | **Duplicates (%)** |
+|--------------------------|:--------------:|:-----------------------------:|:------------------:|
+| Ulysses-Tesemõ           |    2,216,656   |           1,737,720           |        21.61       |
+| MultiLegalPile (PT)      |                |                               |                    |
+|    CJPG                  |   14,068,634   |           6,260,096           |        55.50       |
+|    BRCAD-5               |    3,128,292   |            542,680            |        82.65       |
+|    EUR-Lex (Caselaw)     |     104,312    |             78,893            |        24.37       |
+|    EUR-Lex (Contracts)   |     11,581     |             8,511             |        26.51       |
+|    EUR-Lex (Legislation) |     232,556    |             95,024            |        59.14       |
+|    Legal MC4             |     191,174    |            187,637            |        1.85        |
+| ParlamentoPT             |    2,670,846   |           2,109,931           |        21.00       |
+| Iudicium Textum          |     198,387    |            153,373            |        22.69       |
+| Acordãos TCU             |     634,711    |            462,031            |        27.21       |
+| DataSTF                  |     737,769    |            310,119            |        57.97       |
+| **Total (LegalPT)**      | **24,194,918** |         **11,946,015**        |      **50.63**     |
 
 ## Citation