| What are truncated norms and how do they affect a child's score?
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The term truncated is most often used to refer to a type of sampling procedure used in standardized test development. Truncated sampling occurs when children with language disorders or other special needs (who would probably score in the lower performance range) are excluded from the normative sample. When tests are sampled using only the ability range of "normal" children, then those "normal" children form the floor of the norms. This can result in falsely identifying a portion of the "normal" population as language impaired.
If you are interested, we can provide a copy of an excellent article on truncated sampling, "Creating Language Impairments in Typically Achieving Children: The Pitfalls of 'Normal' Normative Sampling" by Teresa Ukrainetz McFadden as published by the American Speech-Language-Hearing Association: Language, Speech, and Hearing Services in Schools Vol 27 0161-1461/96/2701-0003. Copies can be obtained by email to Lisa Dunham/Development at lisad@agsnet.com
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