RSI readings that lie on thin SET names

In the Min Buri room we keep a simple rule on the blackboard: name the liquidity before you name the oscillator. RSI does not know that a stock printed four board lots between 14:00 and 16:30. Traders still treat 70 and 30 as events.

During the March clinic we pulled three SET-listed names with average daily value under a threshold the group agreed was “thin for our purposes.” On two of them, RSI(14) spent more than a third of the prior quarter above 60 simply because small upticks stacked. The third spent days pinned near 50 with a jagged look that vanished on a 21-period reading.

The exercise is not to abandon RSI. It is to write, next to every circled extreme, the day’s turnover and whether the bar was an auction or a shrug. Students who skip that sentence tend to annotate ghosts.

Bring to the next clinic: one chart where RSI looked decisive and one sentence on volume that either supports or kills the mark.