These papers use rigorous experimental and statistical methods that improve validity of the evidence presented within them.

文献内容所依赖的论据，全部都由严谨的实验方法和统计学方法验证过。

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Experimental results proves the validity of this method.

实验结果证明了该方法的有效性。

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Experimental results verify the validity of this algorithm.

实验结果验证了该方法的有效性。

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"The experimental evidence ... provides no reason to challenge the validity of the improvements".

BBC: graph of results trend

Thomas Cook, a pioneer of controlled experiments in education at Northwestern University, in Chicago, suggests that much of the opposition to experimental evaluation stems from a common philosophical malaise among social scientists, who doubt the validity of the natural sciences, and therefore reject the potential of knowledge derived from controlled experiments.

ECONOMIST: Social science: Try it and see | The