BMC Bioinformatics

Table 5 Data sets at each step 1 – 8

From: Issues in learning an ontology from text

Step	1	2,3	4	5a	5b	6a	6b	7a	7b	8a	8b
Number of articles	623
Number of noun phrases		135026
Number of terms			98435
Number of terms selected				13755	13755
Number of classes						18171	14251	18055	12383	18055	12383
Subclass axioms						16877	11716	16876	10497	17393	12326
Top level clases						1294	2535	1179	1886	662	58
Maximum Depth						5	5	5	5	8	13
Average Depth						2.4	2.1	2.4	2.2	3.1	1.4
Maximum span						1294	2535	1179	1886	778	557
Average Span						1.7	1.8	1.7	1.8	1.7	2.2

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ISSN: 1471-2105

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