The tails of p
Bilateral vs unilateral testing. We can choose between a bilateral vs unilateral testing. In the second case, we assume the direction of the difference in effect.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Category Statistics
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.
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.