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).
25 lines
429 B
Plaintext
25 lines
429 B
Plaintext
Date,Dividends
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2008-06-25,0.156
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2008-12-23,0.336
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2008-12-29,0.045
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2009-06-23,0.162
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2009-12-22,0.212
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2009-12-29,0.025
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2010-06-23,0.403
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2010-12-21,0.415
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2010-12-29,0.036
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2011-06-22,0.545
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2011-12-20,0.273
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2012-06-21,0.657
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2012-12-18,0.163
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2012-12-27,0.022
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2013-06-27,0.677579
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2013-12-18,0.227523
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2014-06-25,0.478482
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2014-12-17,0.57655
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2015-06-25,0.377609
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2015-12-21,0.545399
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2016-06-22,0.191366
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2016-12-21,0.387303
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2017-06-20,0.156
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