Smoothing creates both clarity and delay
A simple moving average adds the latest closing prices and divides by the number of observations. The shorter window replaces old prices more quickly, so it usually reacts sooner. Longer windows smooth more fluctuations, but they also retain older information for longer. Exponential averages use different weights and therefore do not produce identical crossover dates.
A rising short average crossing a long average may describe improving recent prices. It does not establish that a new trend will persist. In a sideways market, small alternating movements can produce repeated crossings, commonly called whipsaws. Transaction costs can make frequent changes particularly consequential.
A crossover calculated from six fictional closes
Assume closing prices are 12, 11, 10, 9, 10 and 12 dollars. At the fifth close, the three-session average is (10 + 9 + 10) / 3 = 9.67 and the five-session average is 10.40. At the sixth close, they become (9 + 10 + 12) / 3 = 10.33 and (11 + 10 + 9 + 10 + 12) / 5 = 10.40. No upward crossover has occurred, despite a rise from 9 to 12. A seventh close at 13 raises the averages to 11.67 and 10.80: the crossover arrives after that rebound.
A parameter choice is a hypothesis
Shortening the windows may recognize some changes earlier while adding noise. Choosing settings only because they fit a few attractive historical turns risks overfitting. A crossover also depends on the price input, session definition and available history. A weekly average uses weeks, not the same number of daily observations.
Check the underlying completed prices first
Use available completed candles to identify when the rebound actually began and when a separately calculated crossover became knowable. Compare both dates rather than assuming the crossing predicted the low. Student Wyckoff Pro provides chart analysis; this explanation does not assert that a moving-average overlay is available in its workspace.
Primary sources
Sources explain the mechanics and limitations; the editorial examples use invented numbers rather than market quotations.
Your next practical step
Inspect the completed price sequence and compare it with the timing of a calculated crossover.
Open the first-chart instructions ↗