type I error


: rejection of the null hypothesis in statistical testing when it is true

Examples of type I error in a Sentence

Recent Examples on the Web Perhaps there were unreported experiments that did not agree with the theoretical claims; perhaps the experiments were run in a way that improperly inflated the success and type I error rates, which would render the statistical inferences invalid. Neuroskeptic, Discover Magazine, 17 Oct. 2014

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'type I error.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1947, in the meaning defined above

Time Traveler
The first known use of type I error was in 1947

Dictionary Entries Near type I error

Cite this Entry

“Type I error.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/type%20I%20error. Accessed 30 Nov. 2023.

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