The phrase means because he himself said it. In expert practice it describes opinions supported only by the expert's authority, without a methodology connecting data to conclusion.
Joiner held that nothing requires admitting opinion connected to data only by the expert's ipse dixit.
Alternative Names:
Ipse Dixit Opinion, Because I Say So
Why it Matters?
The challenge succeeds where an expert cannot articulate the steps from evidence to conclusion, which frequently surfaces at deposition when asked how a conclusion was reached. Building that record is the work: asking what data supported each step, what alternatives were considered, and what would have changed the opinion. An expert who answers by restating credentials has supplied the material for the motion.
Frequently Confused with
Related terms
Frequently asked questions
How is ipse dixit established?
What deposition questions build the record?
