检验单个变量对因变量回归是否有结构性变化可以用suchowtest depvar [indepvars] [if] [in] [weight] [, options]
options Description
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Model
thresv(varname) indicates the threshold variable
stub(string) designates a string name from which new
variable names will be created
fpctile(#) specifies the lower bound percentile of the
threshold variable
lpctile(#) specifies the upper bound percentile of the
threshold variable
step(#) indicates the step by which we want to move
the sample's break point
sig(#) designates the significance level we want to
set for the p-value of the Chow test
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