glm with multiple vars
On 11-04-09 10:34, dirknbr wrote:
I am looping through various models with different combinations of independent variables which are stored as columns in x glm(y ~ ??, data=x) How can I pass the colnames of the selected columns of x into ?? seperating them with a + ie I want to generate glm(y ~ x1 + x2, data=x) glm(y ~ x2 + x3, data=x) glm(y ~ x1 + x2 + x4, data=x) ... I have tried the sedit function (sedit(colnames(current),' ',' + ')) but glm doesn't understand the output.
Hi, you could try to generate the formula as a character string and then coerce it into a formula object, since glm expects a formula object: vars <- names(x) f <- as.formula(paste(vars[1], "~", paste(vars[-1], collapse="+"), collapse="")) glm(f, data=x) Of course, the pastes in the f-line need to be adjusted in each loop. HTH, *S*
Sascha Vieweg, saschaview at gmail.com