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).
639 B
639 B
| 1 | Date | Dividends |
|---|---|---|
| 2 | 2014-01-30 | 0.01 |
| 3 | 2014-02-27 | 0.01 |
| 4 | 2014-03-28 | 0.016 |
| 5 | 2014-04-29 | 0.025 |
| 6 | 2014-05-29 | 0.021 |
| 7 | 2014-06-27 | 0.016 |
| 8 | 2014-07-30 | 0.016 |
| 9 | 2014-08-28 | 0.012 |
| 10 | 2014-09-29 | 0.008 |
| 11 | 2014-10-30 | 0.012 |
| 12 | 2014-11-26 | 0.011 |
| 13 | 2014-12-05 | 0.4 |
| 14 | 2014-12-30 | 0.012 |
| 15 | 2015-01-29 | 0.011 |
| 16 | 2015-02-26 | 0.009 |
| 17 | 2015-03-30 | 0.004 |
| 18 | 2015-04-29 | 0.007 |
| 19 | 2015-05-28 | 0.011 |
| 20 | 2015-06-29 | 0.012 |
| 21 | 2015-07-30 | 0.015 |
| 22 | 2015-08-28 | 0.01 |
| 23 | 2015-09-29 | 0.004 |
| 24 | 2015-10-29 | 0.007 |
| 25 | 2015-11-27 | 0.006 |
| 26 | 2015-12-04 | 0.359 |
| 27 | 2015-12-30 | 0.005 |
| 28 | 2016-01-26 | 0.006 |
| 29 | 2016-02-24 | 0.006 |
| 30 | 2016-03-28 | 0.005 |
| 31 | 2016-04-26 | 0.007 |
| 32 | 2016-05-25 | 0.011 |
| 33 | 2016-06-27 | 0.012 |
| 34 | 2016-07-26 | 0.013 |
| 35 | 2016-08-26 | 0.011 |
| 36 | 2016-09-27 | 0.005 |
| 37 | 2016-10-26 | 0.006 |
| 38 | 2016-11-25 | 0.007 |