是你那样写的吗？

看看帮助的例子啊。   

----------------------------------------------------------------------------------------------------------------
    Setup
        . webuse egenxmpl4, clear

    Create hsum containing the row sum of a, b, and c for each row
        . egen hsum = rowtotal(a b c)

    Create havg containing the row mean of a, b, and c for each row
        . egen havg = rowmean(a b c)

    Create hstd containing the row standard deviation of a, b, and c for each row
        . egen hsd = rowsd(a b c)

    Create hnonmiss containing the number of nonmissing observations of a, b, and c for each row
        . egen hnonmiss = rownonmiss(a b c)

    Create hmiss containing the number of missing observations of a, b, and c for each row
        . egen hmiss = rowmiss(a b c)

    List the results
        . list

谢谢版主。

但是我参考的重庆大学出版社《应用stata做统计分析》的301页就是用的egen sum= rowsum(x,y,z)。还用逗号隔开的，不是空格。

他这种是错误的吗？

是第30页吧。尽信书则不如无书，要相信自己

[此贴子已经被作者于2009-5-6 13:12:05编辑过]

对，是30页。

std（）也错了吧，应该是sd（）吧。

逗号和空格都行吗？

要查stata的帮助。