解释:
1、thres(varname) specifies threshold variable, as denoted by q_it in Hansen(1999). Note that this option should not be omitted.
2、dthres(varname) specifies the variable that will show threshold effects, as denoted by x_it in Hansen(1999). This variable will be multipled by the indicator function I(.). Note that this option should not be omitted either.
3、 qn(#) specifies the number of distinct values to be search in finding out the optimal estimate of threshold effects, r_hat, which will minimize the sum of square residuals of the model. The default value is 400.