# Tagged Questions

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### Weird formula for linear regression

I'll try to make the matter as clear as possible given the circumstances. My boss asked me to look at an old report a former employee wrote around a couple of months ago. Apparently the report ...
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I am slightly getting confused at the presentation of regression models. What would be the difference between these two: $y = \beta_0 + \beta_1 x_1 + \beta_2 x_2$ $y = \gamma_0 + \gamma_1 x_1 + ... 1answer 176 views ### Proof of normal equation in regression using tensor notation I'm struggling with a proof of the normal equation, so I posted a question which hopefully will get resolved soon. However, I mentioned there that I'm uncomfortable with the proofs dealing with matrix ... 2answers 182 views ### Correct enunciation of$ \, \sum \big( {Y_{i}}-{ \hat{Y}_{i}} \big)^2\$

How can I enunciate this notation correctly, could you show me that, please? $$\sum \big( {Y_{i}}-{ \hat{Y}_{i}} \big)^2$$ Thank you very much.