Hi:effects, e.g., the drug has effects.
In conducting a clinical trial for testing the relationship between the new object (drugs, devices, or medical procedures) and the standard/old object, we need to define first the margin indicating the magnitude of the effect observed has clinical
But how do we properly define this margin? For a drug trial, at least we could set this margin to be larger than the effect observed when a placebo is given. Nevertheless, we do not have something equivalent to placebo if we are conducting a trial fornew surgical procedures.
Thus. are there general guidelines for determining the value for the margin?
Well, indeed we could learn something from prior studies. While
this is conceptually true, it is difficult to apply this in an actual situation.
It would be clearer if an illustration showing a practical situation
would be available. For example, we want to compare the ability of a
new method of imaging for identifying something like a tumor with the
ability of the standard method like an X-ray.
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