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There has been much recent discussion about problems associated with the use of 'statistical significance' and the resulting dichotomy; p<0.05 supports the presence of an effect, while p>0.05...
Lecture given in-company a few weeks ago. They were especially interested in propensity scoring in observational studies You can download the slides for the lecture here - Life, the Universe...
When the proportional hazards assumption does not hold, for example when Kaplan-Meier curves are together up to a certain point in time and then diverge, or when they converge over time, or when...
I have found this publication an excellent introduction to the use of propensity score methodologies in observational studies http://pareonline.net/getvn.asp?v=18&n=13