[R] How to remove the double or single quote from a string (unquote?)?

Is there a function to get a string without a pair of quotes around it? I have several expressions like: glm(V12 ~ V3, family=binomial, data=df1) glm(V12 ~ V4, family=binomial, data=df1) ... glm(V12 ~ V8, family=binomial, data=df1) As you can see, the only differences among them are V3 ... V8. B

[R] Is there any function can be used to compare two probit models made from same data?

hi, people How can we compare two probit models brought out from the same data? Let me use the example used in "An Introduction to R". "Consider a small, artificial example, from Silvey (1970). On the Aegean island of Kalythos the male inhabitants suffer from a congenital eye disease,