请大家帮忙看看审稿专家的意见

　　请大家帮忙看看审稿专家的意见，我不太明白审稿专家的意见，谢谢！
You can combine the data on the haustorial connections with the data on biomassand make a correlation between the observed-expected values of the haustorial connection and fitted values for the biomass of each species.
===有问必答===

可是数据包含理论值、观测值还有各个的生物量，三个变量怎么做回归啊