Question: in baseball statistics what does opie s stand for
[{'answer': 'On - base plus slugging', 'provenance': [{'wikipedia_id': '3810', 'title': 'On-base plus slugging', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '3810', 'title': 'On-base plus slugging', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 446, 'bleu_score': 0.9430699958503841, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2418882806396193646}, 'section': 'Section::::Abstract.'}]}]