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).
535 B
535 B
| 1 | Date | Dividends |
|---|---|---|
| 2 | 1999-11-10 | 0.0 |
| 3 | 2000-11-13 | 0.0 |
| 4 | 2001-12-21 | 0.29 |
| 5 | 2002-10-31 | 0.044 |
| 6 | 2010-12-02 | 0.0 |
| 7 | 2011-12-12 | 0.0 |
| 8 | 2012-12-13 | 0.052 |
| 9 | 2013-12-13 | 0.0 |
| 10 | 2014-12-12 | 0.0 |
| 11 | 2015-12-11 | 0.0 |
| 12 | 2016-12-06 | 0.061 |
| 13 | 2017-07-20 | 0.0 |
| 14 | 2017-10-12 | 0.07 |
| 15 | 2017-12-04 | 0.278 |
| 16 | 2018-04-11 | 0.319 |
| 17 | 2018-07-19 | 0.284 |
| 18 | 2018-10-11 | 0.27 |
| 19 | 2018-12-06 | 0.267 |
| 20 | 2019-04-10 | 0.243 |
| 21 | 2019-07-18 | 0.223 |
| 22 | 2019-10-10 | 0.318 |
| 23 | 2019-12-05 | 0.26 |
| 24 | 2020-04-08 | 0.0 |
| 25 | 2020-04-30 | 0.081 |
| 26 | 2020-06-30 | 0.089 |
| 27 | 2020-07-31 | 0.094 |
| 28 | 2020-08-31 | 0.124 |
| 29 | 2020-09-30 | 0.131 |
| 30 | 2020-10-30 | 0.1 |
| 31 | 2020-11-30 | 0.106 |
| 32 | 2020-12-31 | 0.128 |
| 33 | 2021-01-29 | 0.093 |