请教各位，最近在看一篇论文，提到了pseudo conditional maximum likelihood，文中也提供了log-function，但是自己在stata中写基本架构的时候却不知道怎么写。 感谢指教。原文是 Boucher, Vincent, et al. "Do peers affect student achievement? evidence from canada using group size variation." Journal of applied econometrics 29.1 (2014): 91-109.