Oh, I see the utility of that now. Definitely will be using "term.labels"
(which I was not aware of). Thanks!
On Thu, Mar 23, 2017 at 9:48 AM, William Dunlap wrote:
> If you are trying to see if one model nested in another then I think
> looking at the 'term.labels' attribute of terms(formula) i
If you are trying to see if one model nested in another then I think
looking at the 'term.labels' attribute of terms(formula) is the way to
go. Most formula-based modelling functions store the output of
terms(formula) in their output and many supply a method for the terms
function that extracts th
Thanks for the additional response, Bill. I did not want to bog down
the question with the full context of the function. Briefly, given a
set of nested and non-nested regression models, I want to compare AIC
(bigger model - smaller model) and do an LRT for all the nested models
that differ by a sin
You did not describe the goal of your pattern matching. Were you trying
to match any string that could be interpreted as an R expression containing
X1 and X3 as additive terms? If so, you could turn the string into a one-sided
formula and use the terms() function. E.g.,
f <- function(string) {
Wow. Thanks to everyone (Jim, Ng Bo Lin, Bert, David, and Ulrik) for
all the quick and helpful responses. They have given me a better
understanding of regular expressions, and certainly answered my
question.
Joe
On Wed, Mar 22, 2017 at 12:22 AM, Ulrik Stervbo wrote:
> Hi Joe,
>
> you could also
Hi Joe,
you could also rethink your pattern:
grep("x1 \\+ x2", test, value = TRUE)
grep("x1 \\+ x", test, value = TRUE)
grep("x1 \\+ x[0-9]", test, value = TRUE)
HTH
Ulrik
On Wed, 22 Mar 2017 at 02:10 Jim Lemon wrote:
> Hi Joe,
> This may help you:
>
> test <- c("x1", "x2", "x3", "x1 + x2 +
> On Mar 21, 2017, at 6:31 PM, Bert Gunter wrote:
>
> It is not clear to me what you mean, but:
>
>> grep ("x1 \\+.* \\+ x3",test, value = TRUE)
> [1] "x1 + x2 + x3"
>
> ## This will miss "x1 + x3" though.
So then this might be acceptable:
grep ("x1\\ \\+.* x3", test, value = TRUE)
>
> se
It is not clear to me what you mean, but:
> grep ("x1 \\+.* \\+ x3",test, value = TRUE)
[1] "x1 + x2 + x3"
## This will miss "x1 + x3" though.
seems to do what you want, maybe. Perhaps you need to read up about
regular expressions and/or clarify what you want to do.
Cheers,
Bert
Bert Gunter
"
Hi Joe,
This may help you:
test <- c("x1", "x2", "x3", "x1 + x2 + x3")
multigrep<-function(x1,x2) {
xbits<-unlist(strsplit(x1," "))
nbits<-length(xbits)
xans<-rep(FALSE,nbits)
for(i in 1:nbits) if(length(grep(xbits[i],x2))) xans[i]<-TRUE
return(all(xans))
}
multigrep("x1 + x3","x1 + x2 + x3")
Hi Folks,
Is there a way to find "x1 + x2 + x3" given "x1 + x3" as the pattern?
Or is that a ridiculous question, since I'm trying to find something
based on a pattern that doesn't exist?
test <- c("x1", "x2", "x3", "x1 + x2 + x3")
test
[1] "x1" "x2" "x3" "x1 + x2 +
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