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Old 09-19-2012, 12:06 AM
Daniel Daniel is offline
Junior Member
Join Date: Jun 2012
Posts: 4
Default Re: Normal equation in linear regression

Dr. Ng derived the Normal Equation in class, see Lecture 4-6 and he also cautioned about the case where X'*X is non-invertible which meant that there were redundant features (linearly dependent) or too many features (m <= n).

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