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   DIR Return to: Questions for R / RStudio (Fall 2023)
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       #Post#: 77--------------------------------------------------
       Error in R ll Basics Lab
   DIR By: aas423
       Date: August 31, 2023, 3:49 pm
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       [img]
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       Please let me know if you see anything that I am doing that is
       incorrect. As of now, I believe my X and Y matrix(s) are
       correctly initialized.
       #Post#: 79--------------------------------------------------
       Re: Error in R ll Basics Lab
   DIR By: Taeho Kim
       Date: September 1, 2023, 3:30 pm
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       Sorry for late response.
       X^TX becomes t(X)%*%X.
       So, in your case, XTransposeX needs to be
       TransposeX %*% X
       #Post#: 90--------------------------------------------------
       Re: Error in R ll Basics Lab
   DIR By: aas423
       Date: September 3, 2023, 7:12 am
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       Ahh! Can't believe I skimmed that too quickly, thanks!
       #Post#: 91--------------------------------------------------
       Re: Error in R ll Basics Lab
   DIR By: Taeho Kim
       Date: September 3, 2023, 10:23 am
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       No worries. It's a common mistake for this type of questions,
       especially since matrix multiplication isn't symmetric.
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