search for: patsi

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2007 Jul 13
1
imposing constraints on the covariance matrix of random effects in lme4?
Hello all, I am using lme4 to fit some mixed logistic regressions. I need to impose an identification constraint of the following form: (1 sig12) (sig12 sig22) and have not figured out how to do it, i.e., sig11 = 1 but the rest of the parameters are free to vary. Is this possible and, if so, how? I've been looking through the archive and help to no avail, but perhaps I'm just
2001 Oct 25
1
Why won''t this box route ICMP echo reply packets???????
Hi All - I looked for mention of this in the archives but wasn''t able to find anything. This isn''t even an advanced routing question, it should be a dirt-simple, basic, no-brainer, routine routing job. But I''m not getting it! I have a Linux iptables based firewall system that is making me crazy. The gist of the problem is, even when I turn off all firewall rules