Simplifying the impact
Other impact numbers. Other impact number, absolute and relative impact numbers, used to assess the results of observational studies are reviewed.
Science without sense...double nonsense
Evidence Based Medicine pills
Science without sense...double nonsense
Evidence Based Medicine pills
Read MoreSimplifying the impact
The tribulations of an interval
NNT’s confidence interval. The calculation and interpretation of the confidence intervals of the number needed to treat are described, including the negative extremes of the interval.</p The number needed to treat (NNT) is an impact measure that tells us in…
A case of misleading probability
Bayes’ theorem. We describe the concept of conditional probability and the development of Bayes’ theorem, used to calculate the conditional probability of an event. Today we are going to see another of those examples where intuition about the value of certain…
Regular customers
Re-randomization in clinical trials. Re-randomization is the ability to randomize trial participants on more than one occasion, useful when large samples are required.
The fairground shotgun
Random error and systematic error. We describe two types of errors, the random error due to measurement randomness and inaccuracies, and the systematic error or bias.