Copying a 9-period exponential average onto a weekly chart feels responsive. It also invents crosses every time price breathes. Swing traders who hold eight to twenty sessions need averages that ignore those breaths.
Horizon first, period second
Before choosing a number, write the intended hold. If your notes show exits after two weeks, a 9-period line on the weekly pane is measuring noise relative to that plan. A 20 or 30 simple average often sits closer to the structure you actually trade.
A practical check
Open six months of a liquid ASX industrial on the weekly. Plot your current fast average beside a slower simple average tied to your hold. Count how many crosses occur in clearly sideways stretches. The count usually argues for the slower line.
What we teach next
Period contracts are session two of the Moving Average Framework Intensive. Until then, refuse to keep a period you cannot explain in one sentence tied to holding time.