{"slug":"the-january-effect","qid":"january_sample_size","label":"Every January on the daily tape, in trading sessions","post_title":"The January Effect: Does It Still Work?","post_url":"/blog/the-january-effect#q-january_sample_size","columns":["year","january_sessions"],"rows":[{"year":"2004","january_sessions":20},{"year":"2005","january_sessions":20},{"year":"2006","january_sessions":20},{"year":"2007","january_sessions":20},{"year":"2008","january_sessions":21},{"year":"2009","january_sessions":20},{"year":"2010","january_sessions":19},{"year":"2011","january_sessions":20},{"year":"2012","january_sessions":20},{"year":"2013","january_sessions":21},{"year":"2014","january_sessions":21},{"year":"2015","january_sessions":20},{"year":"2016","january_sessions":19},{"year":"2017","january_sessions":20},{"year":"2018","january_sessions":21},{"year":"2019","january_sessions":21},{"year":"2020","january_sessions":21},{"year":"2021","january_sessions":19},{"year":"2022","january_sessions":20},{"year":"2023","january_sessions":20},{"year":"2024","january_sessions":21},{"year":"2025","january_sessions":20},{"year":"2026","january_sessions":20}],"shape":"ranking","sql":"SELECT\n    toString(toYear(date)) AS year,\n    count()                AS january_sessions\nFROM global_markets.stocks_daily_aggs\nWHERE ticker = 'SPY'\n  AND toMonth(date) = 1\nGROUP BY year\nORDER BY year","computed_at":"2026-08-11T15:23:02.475960+00:00","elapsed":0.001557724}