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Epidemiology

All that glitters is not gold

Assessment of diagnostic tests. We describe how to assess the power of diagnostic tests: sensitivity, specificity, predictive values, and likelihood ratios.

11/13/2012

Epidemiology

The one with the foreign name

Odds ratio. The odds ratio allows us to calculate the strength of the association between exposure and effect when we do not know the baseline risks.

10/15/2012

Critical appraisal / Epidemiology

Do they not trick you with cheese

Association measures. The measures of association are described and how it is preferable to use absolute measures of impact over relative ones.

10/09/2012

centralization and dispersion centralization and dispersion

Sin categoría / Statistics

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.