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Indicators

Leading vs Lagging Indicators

A lagging indicator turns a while after the price turns, because it carries days of history; a leading one turns almost at once, because it reads today's close against a recent range. This paper shows you both at the euro's low of 13 January 2025 drawn from real candles — the stochastic turning the next day, the twenty-day average five days later — the idea as a boat's bow wave and wake, the two on one chart, why a sum is slower than a ruler, and the two branches of the Indicators menu on your platform.

Difficulty
Beginner
Reading time
5 min
Pages
8
Reviewed by
Saman Rahbar

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One low, two turns

Every indicator is worked out from the bars that have already closed, so every indicator turns after the price does. The two names say how long after. The euro made a low on 13 January 2025. The stochastic — a reading of where the close sits between the last fourteen days' high and low — turned up the next day, from 22 to 27. The twenty-day average turned up on 20 January, five trading days after the low. The first kind is called leading and the second lagging, and that is all the words mean.

The bow wave and the wake

The picture is a boat under way. Behind it the wake spreads out, smooth and wide: a record of where the boat has been, which takes a while to bend when the boat turns. At the bow the wave rises and falls with what the boat is doing this moment. The wake is a lagging indicator and the bow wave a leading one. Neither knows where the boat is going. They differ only in how far behind the boat they read.

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