This field is the average, as frozen at the moment this historical snapshot was taken, of the per-interval delta values for frames transmitted successfully after exactly one collision, taken across the retained collection history for this stats object. Admins watch this to separate a genuinely sustained problem from one noisy interval — if DeltaAvg for singleCollision on this interface is climbing, some background collision activity here is normal on a shared or half-duplex segment, rather than a one-off spike. For example, an average of 1 frames per interval sustained over many polling cycles points at a chronic issue rather than a one-time glitch.