问一道题：NO.PZ2020011101000027

NO.PZ2020011101000027 问题如下 A tests are concteon the log of the ten-yeUS government boninterest rate using ta from 1988 until the enof 2017. The results of the A with fferent configurations of the terministic terms are reportein the table below. The finthree columns report the number of lags incluin the test selecteusing the AIC anthe 5% an1% criticvalues thare appropriate for the sample size anincluterministic terms. interest rates contain a unit root? The first step is to selethe appropriate mol to use. For these, the statisticsignificanof the parameters for the constant antrenmust taken into account.For the trenmol, both of these have t-stats with absolute values 4, well within the boun of statisticsignificaneven the 99% level. Accorngly, the proper mol to stu is the last one. For this mol, the t-ston gamma is to the left of the 1% CV—therefore, the null hypothesis of having a unit root is rejectethe 99% confinlevel. Note thif the proper mol were either the constant or no-trenthen the null hypothesis woulnot rejecte 老师，我不是很明白为什么要选择第三个模型？能再帮忙一下吗，谢谢，盼复！

NO.PZ2020011101000027 问题如下 A tests are concteon the log of the ten-yeUS government boninterest rate using ta from 1988 until the enof 2017. The results of the A with fferent configurations of the terministic terms are reportein the table below. The finthree columns report the number of lags incluin the test selecteusing the AIC anthe 5% an1% criticvalues thare appropriate for the sample size anincluterministic terms. interest rates contain a unit root? The first step is to selethe appropriate mol to use. For these, the statisticsignificanof the parameters for the constant antrenmust taken into account.For the trenmol, both of these have t-stats with absolute values 4, well within the boun of statisticsignificaneven the 99% level. Accorngly, the proper mol to stu is the last one. For this mol, the t-ston gamma is to the left of the 1% CV—therefore, the null hypothesis of having a unit root is rejectethe 99% confinlevel. Note thif the proper mol were either the constant or no-trenthen the null hypothesis woulnot rejecte 看完答案倒是能理解了，问题是在看答案前，不是太容易看出来自变量两行数上面是估计系数，下面是CV，题目没明确说啊。。

NO.PZ2020011101000027问题如下A tests are concteon the log of the ten-yeUS government boninterest rate using ta from 1988 until the enof 2017. The results of the A with fferent configurations of the terministic terms are reportein the table below. The finthree columns report the number of lags incluin the test selecteusing the AIC anthe 5% an1% criticvalues thare appropriate for the sample size anincluterministic terms. interest rates contain a unit root? The first step is to selethe appropriate mol to use. For these, the statisticsignificanof the parameters for the constant antrenmust taken into account.For the trenmol, both of these have t-stats with absolute values 4, well within the boun of statisticsignificaneven the 99% level. Accorngly, the proper mol to stu is the last one. For this mol, the t-ston gamma is to the left of the 1% CV—therefore, the null hypothesis of having a unit root is rejectethe 99% confinlevel. Note thif the proper mol were either the constant or no-trenthen the null hypothesis woulnot rejecte这题想问的是什么，问题是问有没有单位根，答案落在模型选择上是为什么。constant antren和none跟利率是什么关系，跟单位跟什么关系？

NO.PZ2020011101000027 问题如下 A tests are concteon the log of the ten-yeUS government boninterest rate using ta from 1988 until the enof 2017. The results of the A with fferent configurations of the terministic terms are reportein the table below. The finthree columns report the number of lags incluin the test selecteusing the AIC anthe 5% an1% criticvalues thare appropriate for the sample size anincluterministic terms. interest rates contain a unit root? The first step is to selethe appropriate mol to use. For these, the statisticsignificanof the parameters for the constant antrenmust taken into account.For the trenmol, both of these have t-stats with absolute values 4, well within the boun of statisticsignificaneven the 99% level. Accorngly, the proper mol to stu is the last one. For this mol, the t-ston gamma is to the left of the 1% CV—therefore, the null hypothesis of having a unit root is rejectethe 99% confinlevel. Note thif the proper mol were either the constant or no-trenthen the null hypothesis woulnot rejecte 请问为什么还要考虑另外两个自变量σ

NO.PZ2020011101000027 问题如下 A tests are concteon the log of the ten-yeUS government boninterest rate using ta from 1988 until the enof 2017. The results of the A with fferent configurations of the terministic terms are reportein the table below. The finthree columns report the number of lags incluin the test selecteusing the AIC anthe 5% an1% criticvalues thare appropriate for the sample size anincluterministic terms. interest rates contain a unit root? The first step is to selethe appropriate mol to use. For these, the statisticsignificanof the parameters for the constant antrenmust taken into account.For the trenmol, both of these have t-stats with absolute values 4, well within the boun of statisticsignificaneven the 99% level. Accorngly, the proper mol to stu is the last one. For this mol, the t-ston gamma is to the left of the 1% CV—therefore, the null hypothesis of having a unit root is rejectethe 99% confinlevel. Note thif the proper mol were either the constant or no-trenthen the null hypothesis woulnot rejecte