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expression
2006 May 02
2
evaluation of expressions
Hi, all. I'm trying to automate some regression operations in R but am
confused about how to evaluate expressoins that are expressed as
character strings. For example:
y <- ifelse (rnorm(10)>0, 1, 0)
sex <- rnorm(10)
age <- rnorm(10)
test <- as.data.frame (cbind (y, sex, age))
# this works fine:
glm (y ~ sex + I(age^2), data=test, family=binomial(link="logit"),
subset=age<1)...