找到了
noconstant; see [R] estimation options.

    model(lhsonly|rhsonly|lambda|theta) specifies which of the four models to fit.

        model(lhsonly) applies the Box-Cox transform to depvar only.  model(lhsonly) is the default.

        model(rhsonly) applies the transform to the indepvars only.

        model(lambda) applies the transform to both depvar and indepvars, and they are transformed by the same parameter.

        model(theta) applies the transform to both depvar and indepvars, but this time, each side is transformed by a separate parameter.

    notrans(varlist) specifies that the variables in varlist be included as nontransformed independent variables.
应该是
boxcox y x1 x2, notrans(x3 x4) model(rhsonly) 就ok了

不错，谢谢！

box cox的定义不是只能对因变量进行变换吗？
还能转换其他的么？
ps有没有人知道面板非线性模型做这个变换的时候有没有注意的事项呢？

请问您弄清楚了吗……我也不会