Greg Pomerantz
3c5bee96ce
Some dump files carry a trailing 'ctime' column: an older pipeline appended a FULL re-download of the symbol per download (up to ~28 vintages per date, 2019-2022). The consumer keeps the last row per date, so it silently used stale (~2021) vintages where Yahoo later revised values. scripts/clean_multivintage.py keeps, per date, the rows from the newest ctime (event files keep distinct same-day amounts; history/split keep the single newest row), drops the ctime column, sorts by date. Applied to the data root and overrides/frozen (which carried the same artifact): 1,065 files, 2,202,712 stale rows dropped. Also: stripped 3 UTF-8 BOMs (teg/lo/krft), refreshed the event backup with the cleaned files, and re-ran the double-listing scan: category C (83 symbols, 18,636 repeated within-file rows) is fully explained by the multi-vintage artifact and is now gone; A (6,589 pairs, corrected) and B (12,366 pairs, open review list) are unchanged. Whole-set structural QC after cleaning: 0 duplicate dates, 3 syms/15 rows of OHLC invariant violations, 15 syms/2,897 rows of non-positive prices (mostly long-delisted tickers), 8 unsorted files (reader sorts).
31 lines
503 B
Plaintext
31 lines
503 B
Plaintext
Date,Dividends
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1989-02-22,0.037
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1989-12-22,1.093
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1990-02-15,0.052
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1991-12-24,0.03
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1994-12-27,0.709
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1995-12-28,0.902
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1996-12-31,1.426
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1997-12-31,1.604
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1998-12-30,1.32
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1999-12-16,1.221
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2000-12-28,1.787
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2001-12-27,1.061
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2002-12-27,0.203
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2003-12-29,0.036
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2004-12-28,0.202
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2005-12-29,0.874
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2006-12-28,0.66
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2007-12-28,1.059
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2008-12-30,0.357
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2010-12-29,0.29
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2011-12-29,0.452
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2012-12-28,0.322
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2013-12-27,0.391
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2014-12-30,0.609
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2015-12-28,0.192
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2016-12-29,0.05
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2017-12-28,0.094
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2018-12-28,0.742
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2019-12-27,0.229
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