A note on randomization

What is it about?

Explains that the argument that there are indefinitely many confounding factors does not invalidate randomization.

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Why is it important?

There are infinitely many terms in the series 1/2 +1/4 +1/8.... but this does not mean that the sum does not converge. Similarly, although there may be indefinitely many factors affecting outcome in a clinical trial, the sum of their effects may be bounded. Once this is understood, it is seen that the indefinitely many factor argument is a red-herring