Studies evaluating the effectiveness of psychotherapy vary in their attempt to evaluate particular psychotherapies and disorders. They also vary in how they measure improvement. To deal with this diversity and arrive at general conclusions, researchers often combine the results of similar studies using a statistical technique called:

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Meta-analysis is the statistical technique used by researchers to combine results from similar studies, which helps to arrive at general conclusions. This method enables researchers to obtain a more significant and broader sample size, increasing the reliability and validity of the findings. Therefore, meta-analysis is the best choice for this scenario.

Studies Evaluating the Effectiveness of Psychotherapy Vary in Their Attempt