[R] Combination diffrent variables ,how to calculates
Hi, List , i have 6 predictor variables and i want to make possible combinations of these 6 predictors ,all the data is in matrix form , if i am having 6 predictors than possible combination of sets are 64 2 power 6, or 63 ,whatever it may be i want to store the result in another variable to each combination and that i want to put in some model , i want to put every combination in some model ,please help me how to find suitable combinations of these variables i was not able to do this . Any package is there in R which can help me in this regards any help . thanks in Advance ANIL KUMAR( METEOROLOGIST) LRF SECTION NATIONAL CLIMATE CENTER ADGM(RESEARCH) INDIA METEOROLOGICAL DEPARTMENT SHIVIJI NAGAR PUNE-411005 INDIA MOBILE +919422023277 [EMAIL PROTECTED] [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Combination of variables
Hi, List , i have 6 predictor variables and i want to make possible combinations of these 6 predictors ,all the data is in matrix form , if i am having 6 predictors than possible combination of sets are 64 2 power 6, or 63 ,whatever it may be i want to store the result in another variable to each combination and that i want to put in some model , i want to put every combination in some model ,please help me how to find suitable combinations of these variables i was not able to do this . Any package is there in R which can help me in this regards any help . thanks in Advance ANIL KUMAR( METEOROLOGIST) LRF SECTION NATIONAL CLIMATE CENTER ADGM(RESEARCH) INDIA METEOROLOGICAL DEPARTMENT SHIVIJI NAGAR PUNE-411005 INDIA MOBILE +919422023277 [EMAIL PROTECTED] [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Combination of variables
You don't say what model you want to do. It isn't necessary to store each combination of predictors in a separate matrix unless you really need to do this for some other reason, in which case I imagine you could adopt this idea. I dare say there are better ways, but this should work (assuming you want a linear model): x-matrix(runif(30*6),ncol=6) y - rnorm(30) cmbs - list() for (i in 1:6) cmbs - c(cmbs,combn(6,i,simplify=FALSE)) for (i in 1:length(cmbs)) print(summary(lm(y ~ x[,cmbs[[i]]]))) On 22 Jan 2007 08:51:22 -, anil kumar rohilla [EMAIL PROTECTED] wrote: Hi, List , i have 6 predictor variables and i want to make possible combinations of these 6 predictors ,all the data is in matrix form , if i am having 6 predictors than possible combination of sets are 64 2 power 6, or 63 ,whatever it may be i want to store the result in another variable to each combination and that i want to put in some model , i want to put every combination in some model ,please help me how to find suitable combinations of these variables i was not able to do this . Any package is there in R which can help me in this regards any help . thanks in Advance ANIL KUMAR( METEOROLOGIST) LRF SECTION NATIONAL CLIMATE CENTER ADGM(RESEARCH) INDIA METEOROLOGICAL DEPARTMENT SHIVIJI NAGAR PUNE-411005 INDIA MOBILE +919422023277 [EMAIL PROTECTED] [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- = David Barron Said Business School University of Oxford Park End Street Oxford OX1 1HP __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Combination of variables
You might find the following code useful. It's part of a package I'm
developing for interactive model exploration.
Hadley
# Generate all models
# Fit all combinations of x variables ($2^p$)
#
# This technique generalises \code{\link{fitbest}}. While it is much
# slower it will work for any type of model.
#
# @arguments vector y values
# @arguments matrix of x values
# @arguments method used to fit the model, eg
\code{\link{lm}},\code{\link[MASS]{rlm}}
# @keyword regression
fitall - function(y, x, method=lm, ...) {
data - cbind(y=y, x)
combs - do.call(expand.grid, rep(list(c(FALSE, TRUE)), ncol(x)))[-1, ]
vars - apply(combs, 1, function(i) names(x)[i])
form - paste(y ~ , lapply(vars, paste, collapse= + ), sep = )
form - lapply(form, as.formula)
models - lapply(form, function(f) eval(substitute(method(f,
data=data, ...), list(f=f, data=data, method=method
names(models) - 1:length(models)
class(models) - c(ensemble, class(models))
models
}
# Generate best linear models
# Use the leaps package to generate the best subsets.
#
# @arguments model formula
# @arguments data frame
# @arguments number of subsets of each size to record
# @arguments other arguments passed to \code{\link[leaps]{regsubsets}}
# @keyword regression
fitbest - function(formula, data, nbest=10, ...) {
b - regsubsets(formula, data=data, nbest=nbest, ...)
mat - summary(b, matrix.logical = TRUE)$which
intercept - c(, -1)[as.numeric(mat[,1])]
vars - apply(mat[,-1], 1, function(x) colnames(mat[, -1])[x])
form - paste(formula[[2]], ~ , lapply(vars, paste, collapse= +
), sep = )
form - lapply(form, as.formula)
models - lapply(form, function(f) eval(substitute(lm(f, data=data),
list(f=f, data=data
names(models) - 1:length(models)
class(models) - c(ensemble, class(models))
models
}
On 22 Jan 2007 08:51:22 -, anil kumar rohilla
[EMAIL PROTECTED] wrote:
Hi,
List , i have 6 predictor variables and i want to make possible combinations
of these 6 predictors ,all the data is in matrix form ,
if i am having 6 predictors than possible combination of sets are 64 2 power
6, or 63 ,whatever it may be i want to store the result in another variable
to each combination and that i want to put in some model ,
i want to put every combination in some model ,please help me how to find
suitable combinations of these variables
i was not able to do this .
Any package is there in R which can help me in this regards
any help .
thanks in Advance
ANIL KUMAR( METEOROLOGIST)
LRF SECTION
NATIONAL CLIMATE CENTER
ADGM(RESEARCH)
INDIA METEOROLOGICAL DEPARTMENT
SHIVIJI NAGAR
PUNE-411005 INDIA
MOBILE +919422023277
[EMAIL PROTECTED]
[[alternative HTML version deleted]]
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
