Josephine Tracker
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Josephine TrackerSun, 15 Sep 2024 04:15:25 GMT2024-09-15T04:15:25ZRe: Smoothing matrix denoted by "L"
https://communities.sas.com/t5/Statistical-Procedures/Smoothing-matrix-denoted-by-quot-L-quot/m-p/278388#M14688
@rick_SAS Thank you so much Mr Rick for your advice.Maybe I wasn't very clear by sending you my help request.I don't know wether you can help me find my solution by telling me maybe the formula that is used by SAS to find the elements of the diagonal of the smoothing matrix. This will at least help me know how does it work to find the trace, not even to calculate the elements.<BR />Thank you in advance.Sat, 18 Jun 2016 15:00:47 GMThttps://communities.sas.com/t5/Statistical-Procedures/Smoothing-matrix-denoted-by-quot-L-quot/m-p/278388#M14688Josephine2016-06-18T15:00:47ZRe: Smoothing matrix denoted by "L"
https://communities.sas.com/t5/Statistical-Procedures/Smoothing-matrix-denoted-by-quot-L-quot/m-p/277880#M14658
<P>I need to understand well how to display the elements of this matrix because it is very important for the computation of AICC, degree of freedom etc... So when I have to present my statistical study done by SAS using Proc Loess procedure, I might present it very detailed. That's why I need to output "L".</P><P>Kindly note that the my Data is attached. Can you explain to me "L" using my example?</P><P> </P>Thu, 16 Jun 2016 12:53:11 GMThttps://communities.sas.com/t5/Statistical-Procedures/Smoothing-matrix-denoted-by-quot-L-quot/m-p/277880#M14658Josephine2016-06-16T12:53:11ZSmoothing matrix denoted by "L"
https://communities.sas.com/t5/Statistical-Procedures/Smoothing-matrix-denoted-by-quot-L-quot/m-p/277846#M14656
<P>Dear <A href="https://communities.sas.com/t5/SAS-Statistical-Procedures/bd-p/statistical_procedures" target="_self">SAS Statistical Procedures Community</A>,</P><P>I am Josephine Sabbagh, and I have alreay read the "SAS/STAT® 9.2 User’s Guide The LOESS Procedure (Book Excerpt)" in order to apply the Loess procedure to get a fitted curve for a specific model that I am working on.</P><P> </P><P>The guide is very clear and easy to understand, but I still have to ask only one question about how to display the elements of the smoothing matrix denoted by "L" and described in page 3218.</P><P> </P><P>Please note that displaying the trace of L works very easily, but I only need your help to know more about "L".</P><P> </P><P>So if you may please tell me if "L" can be also called "Hat Matrix" or "Projection Matrix" and how to display its elements.</P><P> </P><P>Your help will be much appreciated.</P><P>Thank you in advance!</P>Thu, 16 Jun 2016 10:41:58 GMThttps://communities.sas.com/t5/Statistical-Procedures/Smoothing-matrix-denoted-by-quot-L-quot/m-p/277846#M14656Josephine2016-06-16T10:41:58Z