**Non-parametric statistics** — In statistics, the term non parametric statistics has at least two different meanings: The first meaning of non parametric covers techniques that do not rely on data belonging to any particular distribution. These include, among others:… … Wikipedia

**Order statistic** — Probability distributions for the n = 5 order statistics of an exponential distribution with θ = 3 In statistics, the kth order statistic of a statistical sample is equal to its kth smallest value. Together with rank statistics, order statistics… … Wikipedia

**U-statistic** — In statistical theory, a U statistic is a specific type of estimator defined in a particular way. One use of the concept in statistical theory is that it allows a minimum variance unbiased estimator to be derived from essentially any unbiased… … Wikipedia

**Kendall's W** — (also known as Kendall s coefficient of concordance) is a non parametric statistic. It is a normalization of the statistic of the Friedman test, and can be used for assessing agreement among raters. Kendall s W ranges from 0 (no agreement) to 1… … Wikipedia

**Correlation** — In probability theory and statistics, correlation, (often measured as a correlation coefficient), indicates the strength and direction of a linear relationship between two random variables. In general statistical usage, correlation or co relation … Wikipedia

**Receiver operating characteristic** — In signal detection theory, a receiver operating characteristic (ROC), or simply ROC curve, is a graphical plot of the sensitivity vs. (1 specificity) for a binary classifier system as its discrimination threshold is varied. The ROC can also be… … Wikipedia

**coefficient of correlation** — noun a statistic representing how closely two variables co vary; it can vary from 1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation) what is the correlation between those two variables? • Syn:… … Useful english dictionary

**correlation coefficient** — noun a statistic representing how closely two variables co vary; it can vary from 1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation) what is the correlation between those two variables? • Syn:… … Useful english dictionary

**Kendall tau rank correlation coefficient** — The Kendall tau rank correlation coefficient (or simply the Kendall tau coefficient, Kendall s tau; or tau test(s)) is a non parametric statistic used to measure the degree of correspondence between two rankings and assessing the significance of… … Wikipedia

**regression coefficient** — noun when the regression line is linear (y = ax + b) the regression coefficient is the constant (a) that represents the rate of change of one variable (y) as a function of changes in the other (x); it is the slope of the regression line • Topics … Useful english dictionary