Size and power
Power and sample size. Power and sample size are two related concepts, which have to do with the ability to detect the studied effect.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
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Residuals management
Residuals. The calculation of the residuals of a contingency table is shown, using the observed and expected values.
To p or not to p…¿is that the question?
Hypothesis testing. The two types of errors that can be made in a hypothesis testing are described: type I (false positive) and type II (false negative).
A good agreement?
Kappa coefficient of interobserver agreement. When we have measurements obtained by two observers, the kappa coefficient allows us to separate the degree of coincidence due to chance.
Playing with powers
Centralization and dispersion. The measures of centralization and dispersion, arithmetic mean and standard deviation, as well as the calculation of kurtosis are described.