Tag Symmetry

A matter of pairs

We saw in the previous post how observational studies, in particular cohort studies and case-control studies, are full of traps and loopholes. One of these traps is the backdoor through which data may be eluding us, causing that we get…
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Birds of a feather flock together

Sometimes, we cannot help confounding factors getting involved in our studies, both known and unknown. These confounding variables open a backdoor through which our data can slip, making those measures of association between exposure and effect that we estimate not…
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You can’t make a silk purse…

Propensity score … of a sow’s ear. No, you can’t. As much as you try, it will remain a sow’s ear. And this is because the characteristics or defects of everyone cannot be avoided simply because one does external improvements.…
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The backdoor

I wish I had a time machine!. Think about it for a moment. We should not have to work (we would have won the lottery several times), we could anticipate all our misfortunes, always making the best decision … It…
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Playing with powers

Numbers are a very peculiar creatures. It seems incredible sometimes what can be achieved by operating with some of them. You can even get other different numbers expressing different things. This is the case of the process by which we…
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