In single subject research designs how do you describe a stable baseline trend?

Question

In single subject research designs how do you describe a stable baseline trend?

Answer 1

"Before the treatment is implemented, the behavior is repeatedly assessed until the researcher is convinced that the behavior would not improve over time without an intervention."

http://en.wikipedia.org/wiki/Single_subj...

You need enough initial measurements to provide a statistically meaningful average or mean.  For example, daily probes for at least two weeks before starting and intervention.