search for: rnewb

...1+x2+x3+x4+x5, data=data) is it possible to run all these regs with a single command? given that the bulk of the work for linear regressions is inverting a matrix that depends only on the independent variables, it seems like a waste to do it over and over for each new dependent variable. thanks, Rnewb -- View this message in context: http://www.nabble.com/regression-with-multiple-dependent-variables--tp26088025p26088025.html Sent from the R help mailing list archive at Nabble.com.

...) / (resid err) where .[i,i] means the ith entry on the diagonal of the given matrix. however, doing this gives values that are off by a multiplicative factor. the factor is the same for all coefficients, but it is not 1, and the value varies for different data sets. what is this term? thanks, Rnewb -- View this message in context: http://n4.nabble.com/how-does-R-compute-Std-Error-s-tp1588537p1588537.html Sent from the R help mailing list archive at Nabble.com.

...d by the model. Specifically, I want coeff(b1) + coeff(b2) + coeff(b3) = coeff(c1) + coeff(c2) + coeff(c3) = 0. I could accomplish this by writing code to suitably shift the coefficients after performing the basic regression above, but I'm hoping there's a better way. Is there? thanks, Rnewb -- View this message in context: http://www.nabble.com/linear-model-with-coefficient-constraints-tp25769020p25769020.html Sent from the R help mailing list archive at Nabble.com.

...3 15 40 0 4 0 17 0 5 1 12 0 6 17 45 0 7 4 19 0 8 -13 -16 0 9 -7 5 0 10 -5 22 0 > vec 1 5 8 9 2 -4 -5 5 > data['z']=vec Error in `[<-.data.frame`(`*tmp*`, "z", value = c(2, -4, -5, 5)) : replacement has 4 rows, data has 10 > thanks, Rnewb -- View this message in context: http://n4.nabble.com/updating-subset-of-data-frame-tp931035p931035.html Sent from the R help mailing list archive at Nabble.com.

...type: data[1:3] What if i don't know that the columns that start with 'a' are columns 1-3? Is there any command that will pick out the desired columns automatically? What if i want to match a generic regular expression instead of just looking at the first letter? thanks very much, Rnewb -- View this message in context: http://www.nabble.com/getting-variables-based-on-name-tp25725837p25725837.html Sent from the R help mailing list archive at Nabble.com.