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 Hi!
>I interprete this as following: the simplest tree with xerror under
>min(xerror) + its own xstd
>Neverthless, in some article I read the following rule:
>the simplest tree with xerror under min(xerror) + xstd corresponding to the
>min(xerror)
>Is this a mistake or any variant of 1-SE rule ?

Please refer to page 80 of
Classification and Regression Trees
by Leo Breiman, Jerome Friedman, Charles J. Stone, and R.A. Olshen.
It says

the simplest tree with xerror under min(xerror) + xstd corresponding to the
min(xerror).

although the difference of the two definition is not so large in most cases.
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