threshold,help一下！

没有help到哦，咋弄的？
为什么xtptm命令无法使用啊？

■Run the following two commands in STATA:

net install stthreg,replace force from(http://sph.umd.edu/epib/faculty/mltlee/TR_codes/TR_STATA/)
net get stthreg,replace force from(http://sph.umd.edu/epib/faculty/mltlee/TR_codes/TR_STATA/)

Then, you should have installed "stthreg" package and test datasets in STATA.

■Next, run the following commands to check help files for the "stthreg" package for STATA:

help stthreg
help trhr
help trpredict
help sttrkm

谢谢上面的

恩，安装好了，但怎么使用呢？具体操作步骤是什么？