Question: who is credited with developing the method of least squares for regression
[{'answer': 'Legendre', 'provenance': [{'wikipedia_id': '82359', 'title': 'Least squares', 'start_paragraph_id': 7, 'start_character': 120, 'end_paragraph_id': 7, 'end_character': 128, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '82359', 'title': 'Least squares', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 426, 'bleu_score': 0.9720210313175831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8245395927896450481}, 'section': 'Section::::History.:The method.\n'}]}]