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Year : 2014  |  Volume : 5  |  Issue : 1  |  Page : 27-28

Concept of P-value

Department of Pediatrics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia

Correspondence Address:
Areej Abdul Ghani Al Fattani
Department of Pediatrics, MBC-58, King Faisal Specialist Hospital and Research Center, P. O. Box 3354, Riyadh 11211
Saudi Arabia
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1658-5127.131823

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P -value has been criticized because it is widely misunderstood and don't tell the researchers what they want to know. Many clinical researches mistaken the conclusion of a significant P-value and may be exaggerate small and unimportant difference. In this regard, understanding of meaning and concept of P-value is critical to investigators as well as to readers. In brief, P-value is the probability of observing a difference equals or more extreme than what was actually observed, if the null hypothesis is true. It is not the proportion of chance that might cause the difference. P-value is not the probability of rejecting the null hypothesis, that probability called α (Type1 error). The smaller the P-value, the stronger the evidence against null hypothesis.

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