请教外审的一个问题，如何修改呢？<br>
The authors note the causal effect of STR on SSR, which has been noted in other studies. It would enhance the contribution of the study if the authors compared models using a chi-square test for nested models or AIC for non-nested models. This would allow them to make claims about model fit and further clarify that modeling STR as preceding SSR provides better fit for the model or perhaps show that there is no significant difference in model fit when SSR precedes STR, which points to a need for more research.