求翻译：观察研究常常难获得“有说服力”的统计量，以致观察研究的结果不能外推。使用观察的方法的时候，有些行为是很难以观察出来的，所以结果有时会有偏差是什么意思？

正在翻译，请等待...

The research is often difficult to obtain the "convincing" statistics, so that observation of the results of the study cannot be pushed to the outside. Use the observation of the methods of the time, and some of these acts, it is difficult to observe, the results can sometimes be a deviation

观察研究常常难获得“有说服力”的统计量，以致观察研究的结果不能外推。Use observation method time, some behaviors are observe very with difficulty, therefore sometimes the result can have the deviation

Observational studies are often difficult to obtain "persuasive" statistic, so that study results cannot be extrapolated. When using observation methods, some behaviour is very difficult to observe, so sometimes there will be deviations

正在翻译，请等待...