The false coin
Hypothesis contrast. Statistical significance. Hypothesis contrast related terms are described: type I error, type II error, power, and statistical significance.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Category Statistics
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.
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.