Sources and Corrections

Why there is no address and no form

The site is served as static files with no server-side component. A form here could not deliver anything, and a form that silently discards what you typed is worse than no form at all. A published address would be the same problem in a different shape: an address is a promise that something at the other end is read, and a promise a site cannot keep costs more than the convenience it offers.

So the page you are reading takes the other approach. Everything a correspondent would reasonably want to ask about, which is almost always where did this number come from, is answerable from the page that carries the number.

Where the figures come from

Every number on this site falls into one of three classes, and each page says which applies:

• Computed at build time. Indicator charts are produced by the same formula the page documents, run over a short series so the shape fits on screen. The picture and the text cannot drift apart, because the arithmetic being described is what drew the picture. If a chart looks wrong, the formula printed above it is the thing to check.
• Labelled schematic. Figures marked schematic use illustrative data written to show the shape of a behaviour clearly. They are never a record of a real market, and they say so in the caption rather than in a footnote.
• Documented public statistics. Historical figures, such as the depth of a decline or the time to recovery, are widely published numbers, rounded, and attributed to the specific index they describe. That attribution is the part that matters: the 2000 to 2002 decline was about 78 per cent on the Nasdaq Composite and about 49 per cent on the S&P 500, and quoting one without naming the index is how a single episode acquires two reputations.

How to check a page that looks wrong

Start with the formula, not the chart. Each indicator page states its calculation in full, including the seeding choice and the smoothing constant, because those are where two correct implementations diverge. A reading that disagrees with your platform usually disagrees for one of three reasons: a different lookback, a different average type where the source says only "average", or a different seed for the first value in the series.

Then check the failure modes. Every indicator page carries a section on where its subject misleads, and a reading that looks wrong is often a reading taken in exactly the condition that section describes. An oscillator parked at one end for weeks in a trend is not broken; it is doing what a bounded measure does when the range keeps moving.

If the disagreement survives both checks, the page is the thing at fault rather than your reading of it, and the specific claim to distrust is whichever one the page failed to source.

What this site does not do

Nothing here is for sale. There is no subscription, no alert service, no course, no software, and no affiliate arrangement with any broker or data vendor. No page recommends an action, an instrument or a platform. No cookies are set, no analytics are loaded, and no third-party request is made from any page, which is also why there is nothing here that would need an address to opt out of.