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我有一个问题,也许很简单。在动态面板数据模型(GMM 估计器)中的 Stata 中,您会收到“多种工具”。反过来,在 R 中,您会收到 AR 测试、sargan 测试,但也不会显示“仪器数量”。如何获得R中的乐器数量?感谢您的帮助