| umls-concept:C0008040 | skos:definition | MSH: A distribution in which a variable is distributed like the sum of the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another.,NCI: A mathematical distribution whose shape is determined by its one parameter, the degree(s) of freedom (df). This distribution is often used in inferential statistics in tests of significance. | lld:umls |
