Assessment of NER solutions against the first and second CALBC Silver Standard Corpus
Text mining challenges have been organised to measure the performance of automatic text mining solutions against a manually annotated gold standard corpus (GSC). The preparation of the GSC is timeconsuming and costly and the final corpus consists at the most of a few thousand documents annotated with a limited set of semantic groups. To overcome these shortcomings, the CALBC project partners (PPs) have produced a large-scale annotated biomedical corpus with four different semantic groups through the harmonisation of annotations from automatic text mining solutions, the first version of the Silver Standard Corpus (SSC-I). The four semantic groups were chemical entities and drugs (CHED), genes and proteins (PRGE), diseases and disorders (DISO) and species (SPE). This corpus has been used for the First CALBC Challenge asking the participants to annotate the corpus with their annotation solutions.