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Epidemiology

From bridge to bridge

The concepts of odds and probability are described, as well as their combined use together with the Bayes’ factor for calculating the probability of being sick or healthy after knowing the result of a diagnostic test.

05/03/2022

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.

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.

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.

02/22/2022

Sin categoría / Statistics

A tricky riddle

The harmonic mean is the reciprocal of the arithmetic mean. It is calculated as the total number of observations divided by the sum of the reciprocals. It is used in situations in which it is necessary to average paths of equal length with different times, as well as to average multiples or quotients.

01/25/2022
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