Perfect collinearity - example 1

[jc_]

I noticed that your last update was from almost a year ago. It's such a shame that this wonderful lectures are not updated any longer. Plz remember that there are many people like me who are really grateful for your easy-to-understand lectures so that you may feel like uploading new videos again in the future one day.

[nadekang]

This is actually the best lecture in econometrics I've ever had. Not blaming the professors who taught me econometrics are bad, they were good professors but probably not quite good at teaching. But, imagine a free MOOC video series on Youtube cleared all the confusions that you have since college, geez, this is amazing! Thanks a lot Dr. Lambert.

[jc_]

It's really helping me out following my econometrics class. You're better than my professor man.

[scarletespiritu]

thank you so much for this, it saved me from my econometrics class

[obaidz]

God bless you Dr.
Your lectures are so helpful to any level.

[ecozi]

Why don't we have the problem of collinearity when we include both age and age^2 in the regression? Is it because age^2 is not a linear function of age? But there is "an exact relationship" between age and age^2.

[foss]

Sorry, would it be possible to identify the parameters?

[achwww]

Why don't we have the problem of collinearity when we include both age and age^2 in the regression? Is it because age^2 is not a linear function of age? But there is "an exact relationship" between age and age^2.
^ Really hope know the answer on this too. Thanks!