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Help Please Hello, I want to find the whole hat matrix not only the hat values. Is there anyway that could be extracted from lm function ?. If not, please suggest something else. Direct computations using chol2inv or solve are not stable if t(X)%*%X has  high determinant. In this case lm is still able to produce correct fitted values, hat_value, residuals...etc but direct computations fail to do

Hello, What I am trying to do is: Generate a density plot of a population of data. This data has a bimodal distribution so I've isolated a couple of possible sub-populations and I want to overlay these two density plots over the first to see whether they are contributing to the bimodal population. I can do this fine with plot(density(...)) and lines(density(...)) . But the resulting plots

Hi all, I want to implement a captcha on my register page to help weed out any ''non-human'' visitors. I was told to check out http://expressica.com/simple_captcha/ but the site isnt responding. Does anyone have any other reccomendations that are tried and tested & successful? Many Thanks -- You received this message because you are subscribed to the Google Groups