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Questions about OLS

Guys, have you had questions about Ordinary Least Squares in your interviews? What kind of questions it could be?
presumably you know what it is? do you know how it's used? what it's used for? what types of functions it might suit? how it might be used in a financial sense?
These are quite obvious ones. I found those ones
1.derive the variance of an OLS estimator from the OLS estimate itself)
2. OLS assumptions and remedies for violation
3. how to estimating sample size required for experiment, how to find significance between two sets of measurements, how to analyse non-normal distributions etc...(not actually about OLS)


gosh it's been years, ken, but...Y?

edit: probably would have been dinged :) looking into this now hah