if any of you have done or published 'quantitative' research you'll know how easy it is to massage the data to fit your hypotheses. removing outliers, selecting a statistical method which will draw the right conclusion, etc.
but the bigger point is that you cannot in this case prove a negative, you can only show that there is a link between autism and vaccinnes, not the other way. think of the whole 'scientific' discussion about existence of god. you cant prove he doesn't exist. you can only prove he exists, which is obviously impossible.
so all these studies proving there's no link between vaccinnes & autism or any other neurological disease can come and go, all it will take is 1 single study show that there IS a link and all the others 'proving' the opposite go out the window. but there's no chance of that kind of study becoming accepted by the mainstream scientific community, there's too much pride, money and power involved
