Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

a parameter in several probability distributions utilized in hypothesis testing which has a value different from zero whenever a sample is attained from a populace whose parameters have values different from those ascertained by the null hypothesis being tested. This parameter is imperative in figuring out the power of a statistical process.

NONCENTRALITY PARAMETER: "The non-centrality parameter appears to be nonexistent."

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