Null result
Null result
Null result (pronunciation: /nʌl rɪˈzʌlt/) is a term used in the field of medical research and statistics to denote an outcome where the expected or hypothesized result is not observed or fails to be proven.
Etymology
The term "null" originates from the Latin word "nullus" meaning "not any", while "result" comes from the Latin "resultare" which means "to spring back". In the context of medical research, a null result refers to the absence of any significant findings or outcomes.
Related Terms
- Null hypothesis: A hypothesis that suggests there is no statistical significance between the set of observed and expected data. It is the initial claim that is based on specific characteristics of the observed data, which we would like to reject in favor of an alternative hypothesis.
- Statistical significance: A measure that indicates the probability that the difference between the observed data and the expected data is due to chance. If the probability is less than a predetermined significance level, usually 0.05, the null hypothesis is rejected.
- P-value: The probability of obtaining test results at least as extreme as the results actually observed, under the assumption that the null hypothesis is correct.
- Type I error: The incorrect rejection of a true null hypothesis, often referred to as a "false positive".
- Type II error: The failure to reject a false null hypothesis, often referred to as a "false negative".
See also
External links
- Medical encyclopedia article on Null result
- Wikipedia's article - Null result
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