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[Music] welcome back I just want to be kind of gonna be kind of a short one so in the past couple videos weve been talking about controlling for variables we can close back doors by controlling for certain variables we take out we take what we can explain with those variables and we subtracted out everything thats left over is basically variation that no longer has that back door in it and so we can look at the relationship and if weve closed all the back doors we can say that we have identified the causal effect of X on Y so Im just going to talk about a specific version of controlling thats hat tends to come in very handy because one of the problems with controlling is that you have to actually measure all the controls you have to be able to know what the data is in order to be able to control for it see what it explains in therefore takes a residual now the problem with that is that there is often gonna be some sort of unobserved variable some variable thats on a backdoor pat
