But there's no good evidence to show that there's a causal effect between worry and coming up with solutions.

但是没有充分的证据表明担忧和想出解决方案之间存在因果关系。

The study's authors caution that they cannot estimate the general causal effect of private-equity buy-outs on the press, but only the observed effect on the newspapers in their sample.

该研究的作者提醒称，他们无法判断私募股权收购对新闻界的总体因果影响，只能评估他们在样本中所观察到的对报纸的影响。