Trend Direction & Confidence
Trend analysis in ILS combines two related facts: - whether mastery is moving up or down, and - how confident the system is that the movement is real.
Trend direction
- Up means the latest mastery score is higher than the previous snapshot.
- Down means the latest mastery score is lower.
- Flat means the score has not changed significantly between the last two snapshots.
- No trend means there is only one snapshot and the system cannot determine a direction yet.
Important: “Flat” or “Stable” is a directional signal, not a score judgment. A student can be flat at 3.3 and still be below the target threshold.
Trend confidence
Trend confidence measures how dependable the direction signal is.
- High confidence: multiple consistent snapshots and clear score movement.
- Medium confidence: enough history exists, but the change is smaller or less consistent.
- Low confidence: limited snapshot history or mixed score signals.
- Insufficient: too few snapshots to compute a reliable trend.
Why both matter
- Direction alone can be noisy: a single low score can look like a downward trend.
- Confidence helps teachers interpret whether the direction is stable or temporary.
Example
- A student moves from 6.5 to 7.4, with a prior sequence of rising scores: direction is Up, confidence is High.
- A student moves from 8.0 to 7.8 after only one prior snapshot: direction is Down, confidence is Low.
Last updated: 2026-07-08