Do the statistics make any difference:调查只调查了部分情况，忽略了一部分

The information provided by the author is insufficient for the author to reach the conclusion. the survey only studies the situation of ...(an(some) insignificant case(s)), however, many other more essential cases (related to the final conclusion) were ignored in the survey.(we need to know the condition of some other cases about which we care more/ the current case studied in the survey makes little sense on the final conclusion, the author should provide some more important information about the case he studied. )Lacking further studies on these important issues, the author could not hastily conclude that...merely based on the insignificant study.