[求助]急：panel data 数据如何如何调用？-经管之家官网！

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刚学会STATA，惭愧！我的command是这样的

xmluse "C:\Documents and Settings\Lyun\Desktop\ Assignment\data.xml", doctype(excel) sheet(data)

结果：

no room to add more variables due to 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.
根据warning我试了几次都没办法。怎么回事啊？(我是个很新的新手，计算机程序方面实在是汗一个。别扔我板砖啊）

谢谢指点！

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