因为处理的数据较大，每次进行append的时候总是提示“op. sys. refuses to provide memory Stata's data-storage memory manager has already allocated 1472m bytes and it just attempted to allocate another 16m bytes.  The operating system said no.  Perhaps you are running another memory-consuming task and the command will work later when the task  completes.  Perhaps you are on a multiuser system that is especially busy and the command will work later when activity quiets down.  Perhaps a system administrator has put a limit on what you can allocate; see help memory.  Or perhaps that's all the memory your computer can allocate to Stata.”。在网络上搜集了相关的解决办法，依旧没有解决这个问题。我的电脑内存是4G的，可是stata每次最多只能提供1472M内存，在stata11中set memory处理以后还是最多提供1472M内存，在内存8G的电脑上试过了，结果还是这样。
    实在没有办法，只有请教连老师了，有什么解决方案吗？谢谢连老师