Any experiment has its cost. Under a given significant level, you may minimize the numer of experiments needed to reach the level.

您好bobguy！我只是统计的爱好者，不是统计专业的，可否请您用中文给我指导，非常感谢！

您好bobguy！我您很热心，我的好几个帖子都有您的回答，可否请您帮我回答怎样用SPSS做缺失值的期望最大化法和回归估计法，您可以到我的相应的悬赏帖子里去回答，这样我可以把论坛币给您！谢谢！

谢谢bobguy！我现在理解了“Any experiment has its cost. Under a given significant level, you may minimize the numer of experiments needed to reach the level.”