xtabond2 问题请教

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我已经将mem 设置到1G，变量20个，但还是得不到结果。这怎么处理呢？跪求解答。

Building GMM instruments.no room to add more variables because of width
    An attempt was made to add a variable that would have increased the memory required to store an observation beyond what is currently
    possible.  You have the following alternatives:

     1.  Store existing variables more efficiently; see help compress.

     2.  Drop some variables or observations; see help drop.  (Think of Stata's data area as the area of a rectangle; Stata can trade off
         width and length.)

     3.  Increase the amount of memory allocated to the data area using the set memory command; see help memory.

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关键词：XTABOND abond abo tab alternatives following existing possible

我也设置了 matsize 到5000个， 还是说no room

数据是什么形态，N 和 T 分别是多少？总样本数是多少？

你的模型设定是什么？采用的何种命令进行分析？

诸如此类的问题，还望能尽量说清楚，否则很难解答。