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<>门限回归（门板回归）Stata 代码解读
因变量：Y
自变量： X1, X2, X3, X4, X5, Z1
其中门限变量为：Z1
threshold 函数
*
基础格式：threshold depvar [indepvars] [if] [in], threshvar(varname) [, options]
*
解读
depvar： 被解释变量
indepvars：解释变量（包含门限变量）
if ：条件
in ：范围「in a/b：从a开始到b结束的范围内进行」
threshvar(varname)：门限变量
options：需要就写，不写按默认值运行；options与前面的变量间注意需要加逗号“,”
其中 options 有：
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regionvars(varlist) include region-varying coefficients for specified
covariates
consinvariant replace region-varying constant with a region-invariant constant
用区域可变常数替换区域不变常数
noconstant suppress region-varying constant terms 抑制区域变化的常数项
trim(#) trimming percentage; default is trim(10) 调整比例
nthresholds(#) number of thresholds; default is nthresholds(1); not allowed
with optthresh()；门槛数设定，未设定时默认为1个门槛
optthresh(#[, ictype]) select optimal number of thresholds less than or equal
to #; not allowed with nthresholds() 选择小于或等于＃的最佳阈值数量； 不允许使用nthresholds（）
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*
例1.1：1 门槛-普通门限回归
threshold Y X1 X2 X3 X4 X5 Z1, threshold(Z1) nthresholds(1)
*
例1.2：在X5为1条件下，2门槛-门限回归
threshold Y X1 X2 X3 X4 X5 Z1 if X5 == 1, threshold(Z1) nehreshold(2)
