Tag Power

Rioja vs Ribera

Frequentist vs Bayesian statistics This is one of the typical debates that one can have with a brother-in-law during a family dinner: whether the wine from Ribera is better than that from Rioja, or vice versa. In the end, as…
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hypothesis contrast

The false coin

Hypothesis contrast. Statistical significance Today we’re going to continue playing with coins. In fact, we’re going to play with two coins, one of them a fair coin and the other one faker than Judas Iscariot, loaded to give more heads…
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hypothesis contrast

The tails of p

Bilateral vs unilateral testing Forgive me my friends from the other side of the Atlantic, but I am not thinking about the kind of tails that many perverse minds are. Far from it, today we’re going to talk about a…
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degrees of freedom

Freedom in degrees

Degrees of freedom Freedom is one of those concepts that everyone can understand easily, but it is extremely difficult to define. If you don’t believe me, try to state a definition of freedom and you will see that it is…
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Size and power

Power and sample size Two associated qualities. And very enviable too. Especially when it comes to scientific studies (what were you thinking about?). Although there’re more factors involved, as we’ll see in a moment. Let’s suppose we are measuring the…
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