# leaps

From leaps v2.4
0th

Percentile

##### all-subsets regressiom

leaps() performs an exhaustive search for the best subsets of the variables in x for predicting y in linear regression, using an efficient branch-and-bound algorithm. It is a compatibility wrapper for regsubsets does the same thing better.

Keywords
regression
##### Usage
leaps(x=, y=, wt=rep(1, NROW(x)), int=TRUE, method=c("Cp", "adjr2", "r2"), nbest=10, names=NULL, df=NROW(x), strictly.compatible=T)
##### Arguments
x
A matrix of predictors
y
A response vector
wt
Optional weight vector
int
Add an intercept to the model
method
Calculate Cp, adjusted R-squared or R-squared
nbest
Number of subsets of each size to report
names
vector of names for columns of x
df
Total degrees of freedom to use instead of nrow(x) in calculating Cp and adjusted R-squared
strictly.compatible
Implement misfeatures of leaps() in S
##### Value

• A list with components
• whichlogical matrix. Each row can be used to select the columns of x in the respective model
• sizeNumber of variables, including intercept if any, in the model
• cpor adjr2 or r2 is the value of the chosen model selectionstatistic for each model
• labelvector of names for the columns of x

##### Note

With strictly.compatible=T the function will stop with an error if x is not of full rank or if it has more than 31 columns. It will ignore the column names of x even if names==NULL and will replace them with "0" to "9", "A" to "Z".

##### References

Alan Miller "Subset Selection in Regression" Chapman & Hall

regsubsets, regsubsets.formula, regsubsets.default

• leaps
##### Examples
x<-matrix(rnorm(100),ncol=4)
y<-rnorm(25)
leaps(x,y)
Documentation reproduced from package leaps, version 2.4, License: GPL version 2 or later

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