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...LS coefficients can be obtained. ### including tests to exclude missing observations where necessary. ### ### for a more informed article (and person), see Bates, 'Least Squares ### Calculations in R', Rnews 2004-1. the code here does not test his sparse ### matrix examples, or his geMatrix/poMatrix examples. ### ### Basic Results: for the examples that I tried, typical relative time ### factors of the algorithms were about ### ### lm lmfit solve crossprod cholesky (special-case 2vars) ### 1.0 0.5 0.3 0.15 0.17 0.1 ### ### there was no advantage to cholesky, so...