ⓘ Biostatistics ..

Biostatistics

Biostatistics are the development and application of statistical methods to a wide range of topics in biology. It encompasses the design of biological experiments, the collection and analysis of data from those experiments and the interpretation of the results.

Accuracy and precision

In measurement of a set, accuracy refers to closeness of the measurements to a specific value, while precision refers to the closeness of the measurements to each other. Accuracy has two definitions: Alternatively, ISO defines accuracy as describing a combination of both types of observational error above random and systematic, so high accuracy requires both high precision and high trueness. More commonly, it is a description of systematic errors, a measure of statistical bias; low accuracy causes a difference between a result and a "true" value. ISO calls this trueness. Precision is a des ...

Analysis of rhythmic variance

In statistics, analysis of rhythmic variance is a method for detecting rhythms in biological time series, published by Peter Celec:777–82). It is a procedure for detecting cyclic variations in biological time series and quantification of their probability. ANORVA is based on the premise that the variance in groups of data from rhythmic variables is low when a time distance of one period exists between the data entries.

Beta diversity

In ecology, beta diversity is the ratio between regional and local species diversity. The term was introduced by R. H. Whittaker together with the terms alpha diversity and gamma diversity. The idea was that the total species diversity in a landscape is determined by two different things, the mean species diversity at the habitat level and the differentiation among habitats. Other formulations for beta diversity include "absolute species turnover", "Whittakers species turnover" and "proportional species turnover". Whittaker proposed several ways of quantifying differentiation, and subseque ...

Beverton–Holt model

The Beverton–Holt model is a classic discrete-time population model which gives the expected number n t +1 of individuals in generation t + 1 as a function of the number of individuals in the previous generation, n t + 1 = R 0 n t 1 + n t / M. {\displaystyle n_{t+1}={\frac {R_{0}n_{t}}{1+n_{t}/M}}.} Here R 0 is interpreted as the proliferation rate per generation and K = R 0 − 1 M is the carrying capacity of the environment. The Beverton–Holt model was introduced in the context of fisheries by Beverton & Holt 1957. Subsequent work has derived the model under other assumptions such as conte ...

BMDP

BMDP was a statistical package developed in 1965 by Wilfrid Dixon at the University of California, Los Angeles. The acronym stands for Bio-Medical Data Package, the word package was added by Dixon as the software consisted of a series of programs which performed different parametric and nonparametric statistical analyses. BMDP was originally distributed for free. It was later sold by Statsols, who originally was a subsidiary of BMDP, but through a management buy-out formed the now independent company Statistical Solutions Ltd, known as Statsols. BMDP is no longer available as of 2017. The ...