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significance
[signif′ikəns] Etymology: L, significare, to signify 1 (in research) the statistical probability that a given finding may have occurred by chance alone. The conventional standard for attributing significance is a finding that occurs fewer than 5 times in 100 by chance alone (p |Ld .05). 2 the importance of a study in developing a practice or theory, as in nursing practice. significance the quality of an assessment about the relationship between two or more values of a variable. Significance is achieved if the relationship is more common than would be achieved by a random selection.
significance In statistics, an indication that the results of an investigation on a population (e.g. patients) differ from those of another population (e.g. general) by an amount that could not happen by chance alone. This is evaluated by establishing a significance level, that is the probability, called p value, which leads us to reject or accept the null hypothesis Ho (there is no significant difference between two populations and the difference is attributed to chance) and accept or reject the alternative hypothesis H1 that there is a statistically significant difference between two populations. A p value p < 0.05 is often considered significant, but the lower this figure, the stronger the evidence. See randomized controlled trial.
significance Clinical medicine A finding to be weighed in establishing a diagnosis, or influencing management of, a clinical state, which may be expressed as a finding of significance Statistics A measure of deviation of data
from a statistical mean, defined by a probability–p value, where a p of 0.05 indicates a 5% possibility or 1 chance in 20 that a dataset differs from a mean and 19 chances that it will not. See Clinical significance, Statistical significance. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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