Regarding "if you seem to have done everything correctly", I don't think that any honest scientist can claim that his/her study had no limitation or flaw.
Hear. Hear. This, of course, was the thrust of Richard Feynman's famous Caltech commencement speech on "Cargo Cult Science."
As Feynman said, "The first principle is that you must not fool yourself--and you are the easiest person to fool. So you have to be very careful about that."
Hear. Hear. This, of course, was the thrust of Richard Feynman's famous Caltech commencement speech on "Cargo Cult Science."
http://www.lhup.edu/~DSIMANEK/cargocul.htm (adapted HTML text)
http://calteches.library.caltech.edu/51/2/CargoCult.pdf (PDF version as published by Caltech)
As Feynman said, "The first principle is that you must not fool yourself--and you are the easiest person to fool. So you have to be very careful about that."