Log Rank Test > The Tarone-Ware test is a variant of the log rank test. It is used in survival analysis to compare two different survival distributions. The test can be used to compare a variety of different situations, including:…

# Stress Strength Model: Definition

Statistics Definitions > A stress strength model compares the strength and stresses on a system; it is used primarily in reliability engineering but also in economics, psychology and medicine. In a stress strength model both stresses and strength are considered…

# Bayesian Estimator: Definition

Bayesian Statistics > A bayesian estimator is an estimator of an unknown parameter θ that minimizes the expected loss for all observations x of X. In other words, it’s a term that estimates your unknown parameter in a way that…

# Hyperparameter: Simple Definition

Bayesian Statistics > Hyperparameters are model parameters that are estimated without using actual, observed data. It’s basically a “good guess” at what a model’s parameters might be, without using your actual data. More formally, a hyperparameter is a parameter from…

# Variate / Random variate

Statistics Definitions > The word “variate” means something slightly different, depending on where you’re reading about it. It’s a very loosely defined word, which is one reason why the term isn’t used much in statistics. The Wolfram definition states it…

# Box’s M Test: Definition

Homogeneity of Variances > What is Box’s M Test? Box’s M test (also called Box’s Test for Equivalence of Covariance Matrices) is a parametric test used to compare variation in multivariate samples. More specifically, it tests if two or more…

# Bogardus Scale: Definition & Example

Statistics Definitions > The Bogardus scale is a social distance scale that measures prejudice—or, more precisely, the degrees of warmth, intimacy, indifference or hostility—between an individual and any social, racial or ethnic groups. Developed by Emory Bogardus in 1924 and…

# Bray Curtis Dissimilarity

Statistics Definitions > The Bray Curtis dissimilarity is used to quantify the differences in species populations between two different sites. It’s used primarily in ecology and biology, and can be calculated with the following formula: Where: i & j are…

# Bayesian Information Criterion (BIC) / Schwarz Criterion

Bayesian Statistics > The Bayesian Information Criterion (BIC) is an index used in Bayesian statistics to choose between two or more alternative models. The BIC is also known as the Schwarz information criterion (abrv. SIC) or the Schwarz-Bayesian information criteria.…

# Strip-Plot / Split-Block Design

Design of Experiments > This article is about Strip-Plot experimental design. For the strip plot graph (a type of scatter plot), see: What is a Dot Plot? What is a Strip-Plot Design? You may want to read about factors and…