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...rite the coefficients as a vector? 4) how can I call R function from C code, for example, can I call lm(...) from C functiomns? 5) after experiment designs, we can analyse which factors have big effects, can we construct in R a response surface so that we can optimise the levels of the factors by maxmising the response surface, can you advise me how to do that in R? 6) if the number of factors is over 1000, is it possible to analyse the effect of each factor using the same way as above? Many thanks Dechao > > > > Dear R users, > > > > I did 16 experiments, with 16 response...