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Hi there. Regarding how the data will be collected, when it will be collected, and from whom, I understand there are typically two possible designs—randomized controlled design and pre-post comparison. However, I am not sure how to decide. Could you please help me compare those two?

主頁>網上研討平台>Hi there. Regarding how the data will be collected, when it will be collected, and from whom, I understand there are typically two possible designs—randomized controlled design and pre-post comparison. However, I am not sure how to decide. Could you please help me compare those two?