formula - R: how to pass in a reference to the variable in glm or lm? -

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so let's have named vector:

sorted = c(1,2,3) names(sorted) = c("a","b","c")

and it'll following:

> sorted    b    c 1    2    3

so vector named a,b,c, , has value 1,2,3 respectively.

and have sample data:

data.ex = as.data.frame(matrix(rep(c(1,2,3,4),3), nrow = 3, ncol = 3)) colnames(data.ex) = c("a","b","c")

so data frame has 3 columns named a,b,c well.

i want predict c using value in glm():

fit.ex = glm(formula = c ~ names(sorted)[2],          data = data.ex,          family = binomial(link = "logit"))

but then, i'll keep getting following error message:

error in model.frame.default(formula = c ~ names(sorted)[2], data = data.ex,:  variable lengths differ (found 'names(sorted)[2]')

i read article here , found as.name() function, still not working: http://www.ats.ucla.edu/stat/r/pages/looping_strings.htm

and cannot find else thats similar problem. please, if there thread addressing problem, guide me it! or kind of appreciated! :)

providing answer based on comments:

sorted = c(a=1,b=2,c=3) names(sorted) = c("a","b","c") data.ex = data.frame(a=1:4,b=2:5,c=c(1,0,0,1))

construct list of formulas:

forms <- lapply(names(sorted)[1:2],reformulate,response="c") models <- lapply(forms,glm,data = data.ex,                  family = binomial(link = "logit"))

then can things like

t(sapply(models,coef))

the plyr package handy sort of thing (e.g. plyr::ldply(models,coef))


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