Data sources and limitations
This page explains the source basis behind Deja-view stock and ETF pages.
Price data
Deja-view uses Yahoo Finance daily adjusted close data for historical comparisons.
Generated artifacts
Public stock pages use public/generated/popular-stock-pages.json, which stores the as-of date, generation timestamp, Top 10 similar windows, and outcome distributions.
Known limits
Source delays, missing values, stale fallback, and survivorship bias can remain. Read how it works before citing a result.
Page Information
Frequently Asked Questions
Is deja-view investment advice?
No. Deja-view is a retrospective comparison tool for historical price patterns. It does not provide buy/sell signals, return guarantees, or investment advice.
How often are pages updated?
Static explanation pages are updated when their content changes. Data-backed stock pages and hubs show the generation timestamp from the data artifact.
Who writes and maintains this site?
Deja-view is created and maintained by Baek Kyoungjung (BK). The About page links to public Medium and LinkedIn profiles for author verification.