Choosing swing points on SET Index charts

Bangkok participants often ask why our SET Index trendlines differ from lines they see on social media screenshots. The difference usually starts at swing-point selection, not drawing technique.

Session timing matters

We anchor swings using the official SET morning and afternoon session closes. Lunch-break gaps create discontinuities; ignoring them produces lines that look valid on a continuous chart but misread Thai session structure.

High versus low anchors for uptrends

For ascending trendlines we connect higher lows. A valid low must be lower than the session high that preceded it and lower than the session low that follows it — a local trough visible without zooming below daily resolution.

Avoiding earnings spikes

Single-stock workshops aside, index trendlines should exclude one-day vertical moves driven by a single heavyweight announcement. Mark the spike with a note and restart the swing sequence after volatility normalises, typically two sessions later.

Comparing with regional indices

When SET and SET50 disagree on trend direction, we draw both but label which index a line belongs to. Mixing symbols under one line is a frequent source of invalidation confusion in group reviews.

Bring a printed SET chart to your next workshop and mark five candidate swing lows before arrival. Comparing selections consumes the first anchoring exercise and surfaces habits worth correcting early.