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Sin categoría, Statistics

Sciences or arts

Mann-Whitney U test, also called Wilcoxon rank-sum test, is a non-parametric test that allows comparing the medians of a quantitative variable for the two categories of a dichotomous qualitative variable. It is applied when the assumptions necessary to use the Student's t-test cannot be fulfilled.

Manuel Molina
06/28/2022

Sin categoría, Statistics

The sleepless naturalist

Discrete probability distributions allow us to establish the full possible range of values of an event when it is described with a discrete random variable. Examples of the use of the Bernoulli, binomial, geometric, and hypergeometric distributions are shown.

Manuel Molina
05/24/2022

Sin categoría, Statistics

Moments

Skewness and kurtosis are two of the first four moments of a normal distribution. Both can be used to test the assumption of normality of a data distribution, although they are less widely used than other contrast pr graphical methods.

Manuel Molina
04/19/2022

Sin categoría, Statistics

Counting bugs

The geometric mean is used when the values of the data distribution change multiplicatively, and not additively. This makes it ideal for averaging geometric progression data, such as ratios, compound interest in economics, or bacterial growths in microbiology.

Manuel Molina
03/15/2022

Sin categoría, Statistics

A picture is worth a thousand words

There are three possible strategies o verify that a variable follows a normal distribution: methods based on hypothesis testing, those based on graphical representations and the so-called analytical methods.

Manuel Molina
02/22/2022