[R] Question on partial effect

[Guo Wei-Wei]

Dear all,

I don't know what's my question is called. I have a performance
variable A, such as sales. And I have another variable B, let's say
establish time of firm. I want to create the third variable that is
sales without the effect of establish time. Maybe it can be called
partial effect problem. I'm not sure.

Does anyone have any suggestion? Thank you in advance!

All the best,
Wei-Wei