Hi, Jing Jiang,
maybe
as.formula( paste( "V12 ~ V", i, sep = ""))
inside the call to glm() does what you need.
Hth -- Gerrit
On Tue, 19 Apr 2011, JingJiang Yan wrote:
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.
Because sometimes several of these expressions are performed many times,
I want to use a variable "i" to change the V3 ... V8. I did this with:
i <- 3:8
glm(V12 ~ paste("V", i, sep=""), family=binomial, data=df1)
However, it seems the paste always returns a variable name with a pair of
quotes, which were wrong in such condition.
I only find a function "sQuote" to add quotes to a string, and it looks I am
looking for an opposite function of it.
Any advice will be appreciated.
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