{"fact_id":"return-autocorrelation-us-sp500-fact-median-sharpe","strategy_slug":"return-autocorrelation-us-sp500","claim":"Median Sharpe across 320 grid runs is -0.58.","value":-0.58,"value_text":null,"unit":"sharpe_ratio","context":"Full grid of 320 parameter combinations.","supports_verdict":"rejected","source_run_id":null,"search_tsv":"'-0.58':8 '320':4,12 'across':3 'combin':14 'full':9 'grid':5,10 'median':1 'paramet':13 'run':6 'sharp':2","cite_url":"https://qbuntu.ai/cite/return-autocorrelation-us-sp500-fact-median-sharpe","strategy":{"slug":"return-autocorrelation-us-sp500","name":"Return Autocorrelation Factor (US S&P 500)","verdict":"rejected","url":"https://qbuntu.ai/strategies/return-autocorrelation-us-sp500"},"provenance":{"tier":"shallow","git_sha_z":"1455e77","data_source":"kabu STATION REST API + J-Quants daily bars","source_repo":"C:\\Users\\mirac\\projects\\qbuntu\\analysis","source_files":["scripts/grid_search/autocorrelation_grid.py","src/risk/regime.py"],"computed_asof":"2026-09-24T21:54:29","numpy_version":"2.4.2","pandas_version":"3.0.0","python_version":"3.12.10","source_project":"qbuntu-analysis","git_sha_genkidama":"17a7674"},"license":"CC-BY-4.0"}