Doran, Thanks for your advice.
Sincerely, Jialin Huang On Mon, Mar 12, 2012 at 10:56 AM, Doran, Harold <hdo...@air.org> wrote: > Always start with the help page. But, the best way to get help on this > list is to construct some toy data. Even if imperfect, people will work to > help you. Maybe show us some of your actual data.**** > > ** ** > > Of course, if a and b1 are really scalars, I donât think there is such a > thing as the covariance between two scalars**** > > ** ** > > ** ** > > * * > > ** ** > > *From:* huang jialin [mailto:huangps...@gmail.com] > *Sent:* Monday, March 12, 2012 11:53 AM > *To:* Doran, Harold > *Cc:* r-help@r-project.org > *Subject:* Re: [R] how to calculate a variance and covariance matrix for > a vector**** > > ** ** > > Hi,**** > > ** ** > > Thanks for your response. **** > > ** ** > > I tried to use cov() before, but got NA all over the place.**** > > ** ** > > a and b1 are scalars in the example. So that is the problem. I will start > over from the formula. **** > > ** ** > > Thanks again.**** > > ** ** > > Sincerely,**** > > Jialin Huang**** > > ** ** > > On Mon, Mar 12, 2012 at 10:47 AM, Doran, Harold <hdo...@air.org> wrote:*** > * > > Can you provide sample data? This suggests that a and b1, for example, are > scalars. If that is what you actually have then you cannot produce a > covariance between two scalars.**** > > > > -----Original Message----- > > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On > > Behalf Of huang jialin > > Sent: Monday, March 12, 2012 11:43 AM > > To: r-help@r-project.org > > Subject: [R] how to calculate a variance and covariance matrix for a > vector > > > > Hello, > > > > I have a vector {a, b1, b2, b3, b4}. How can I calculate the following > > matrix: > > > > var(a) cov(a, b1) cov(a, b2) cov(a, b3) cov(a, b4) > > cov(a, b1) var(b1) cov(a, b2) cov(a, b3) cov(a, b4) > > ... > > ... > > cov(a, b1) cov(a, b2) cov(a, b3) cov(a, b4) var(b4) > > > > I would very appreciate your inputs. Thank you very much. > > > > Sincerely, > > Jialin Huang > >**** > > > [[alternative HTML version deleted]]**** > > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code.**** > > ** ** > [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
