Level
Definition
The overall value of the data in a condition — roughly, how high or low the points sit on the vertical axis — often summarized by the mean or median of the phase. A change in level between phases is one of the main things visual analysis looks for.
In plain language
How high or low the data sit on the graph. A jump from a high level to a low one is a change worth noticing.
Example
Baseline data cluster around 12 per session; treatment data cluster around 3. The level dropped.
Not level
Data that start at 12 and fall steadily to 3 within one phase. That is a trend rather than a level change.
See also
Written from
- kazdin-2011
Written from Kazdin (2011). No textbook glossary consulted.
This entry has not yet been through clinical review. Treat it as a draft.