I didn't say it wasn't, if you check back you will see that I said "Now, as it is not appropriate to repeat the process over and over again in the same patient then lots of different but related experiments are conducted."
The kind of repetition being alluded to by your and Ocean's posts is the idea of the exact same experiment being repeated over and over again to ensure the veracity of results. That is of course the cornerstone underpinning evidence provided by many disciplines. Let me be clear I have no argument with that.
In the specific case of a double blinded stage 3 RCT (a particular form of RCT) there are multiple iterations of the experiment but in different people, so there is no way they can be considered exact repetitions as the conditions change with every patient. A physicist may run an experiment 3 times because they can control things to the extent its the same experiment on each of those 3 occasions. That will give them enough to publish. Medical science cannot do that, hence needing dozens, hundreds and sometimes thousands of different but related experiments to add sufficient weight to any evidence. It is still just that, evidence for consideration, not absolute proof.
You asked specifically about double blinding, I was attempting to answer that question. So, we could get into an argument about semantics, not helpful.
Hence, my general point is there are many valid scientific methods of producing evidence which do not involve experimental repetition. Please step back a little bit and consider that.
With the list I gave in my reply to Ocean I have provided a range of examples of methodological approaches which is by no means exhaustive but all have a place in establishing the evidence which drives medical practice.
A stand out example was the case of Fenoterol, a drug used to treat asthma. A group of scientific researchers suspected that the drug was actually responsible for a number of asthma related deaths. They went to the library and archives, not the laboratory or the wards. Their publication in the Lancet at the end of their study was explosive and if the story had happened in the US and not NZ it would have been made into a movie by now. The drug was removed from use and yet not a single experiment was conducted to reach their scientific conclusion.
Lets take another example. I think we can all agree that Stephen Hawking is a scientist yes? He has written about the concept of models to explain various phenomena. At times those models work well and withstand repetitive experimentation. He also explains however that sometimes a model just cannot adequately explain what is going on. No amount of experimental iterations will change that. The only response is to come up with a new model.
The test therefore for knowledge to stand is not necessarily repeated experiments, rather we need to ask "does this explain what we need explained?"
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