举例来说,我要说以下几点:
ylab(expression((hat(beta)^(2))(x)))
但没有括号的括号:<>t(beta)^(2)。 但是,如果我删除括号,那么(x)就可扩展至上。
这些表述中是否有分类? 或者看不见的家长?
这是你想要的吗?
ylab(expression(hat(beta)^(2)*(x)))
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