The curse
Regression to the mean. Regression to the mean explains that, after an extreme value of a variable, the next time we will obtain a value closer to the mean.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Category Statistics
The why and wherefores
Calculating expected values. Calculating expected values is done by multiplying the marginals of the cell and dividing by the total of the table. This rule is reasoned.
Studying or working?
Chi-square test for independence. Chi-square test for independence compares the proportions of two qualitative variables to determine whether or not they are independent.
Solomonic decisions
Chi-square for goodness of fit. Chi-square for goodness of fit allows us to infer whether a sample can come from a given population.
At a rough guess
Signs test. Signs test compares two medians using the direction of the values with respect to the mean and binomial probability.