A simple relationship
Simple regression. The concept of regression is defined and the most used simple regression models are detailed: linear, logistic and proportional hazards regression.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Category Statistics
Black sheep
Outliers. Outliers are values that seems inconsistent with the rest of the values, according to the assumed probability model that they follow in the sample.
Do not eat too many pies
The pie chart. A pie chart is a circle whorepresents the total of the data and to each category is assigned an area directly proportional to its frequency. Pies, how good they are! The problem is that, as you know, what is…
Why spare one?
Biased and unbiased estimators. The mean one of the unbiased estimators and accurately approximates the population value. The standard deviation is a biased estimator.
A box with whiskers
Boxplot. The boxplot is widely used for its descriptive capabilities. It shows, in a simple way, the shape of a distribution.