When is the data updated, and where does it come from?

Alphaviu is not a real-time feed. Scores are calculated on finished sessions, several times every business day, as the markets close.

Where the data comes from

• Prices and fundamental data come from Yahoo Finance.
• News comes from the public news feeds of the tracked stocks; its tone only affects the score of stocks already in the top bands.
• Economic series (rates, inflation, employment) come from the public FRED database of the Federal Reserve Bank of St. Louis.

When it is updated

Here are the usual start times of the calculations, read from our log over the last thirty days, and the latest scored session for each market:

These tables recalculate every time this page is displayed. A time that does not appear for lack of enough runs is not guessed.

What the measurement does not say

• What happens during the session. A session in progress never enters the score: a score read at 11 a.m. is based on the latest close.
• That a source is never wrong. A price can arrive wrong or late. Checks verify every day the share of stocks whose price has arrived, but no check catches everything.
• Public holidays. They are not modelled: a Monday holiday counts as a business day, and a score can look a day late without being so.