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Hello, and please excuse this off-topic question, but I have not been able to find an answer elsewhere. Consider a value Z that is calculated using the product (or ratio) of two means X_mean and Y_mean: Z=X_mean*Y_mean. More generally, Z=f(X_mean, Y_mean). The standard error of Z will be a function of the standard errors of the means of X and Y. I want to calculate this se of Z. Can someone direct me to a reference (text book or other) that gives the solution to this *general* prob...

...cannot replicate the reported residuals using this approach. I also do not know how Z_0 should be calculated, i.e. what does the first step of this recursive procedure look like? >From the residuals, I also cannot replicate the reported standard errors. I am using se(b_j) = sqrt(sigma^2/sum(x_i-x_mean)^2) where sigma =sqrt(SSR/df) Any help on this or explanation of how GLS works would be much appreciated. Any clarification would be much appreciated. [[alternative HTML version deleted]]