normalize {broman} | R Documentation |
Quantile normalization
Description
Quantile normalizes two vectors or a matrix.
Usage
normalize(x, y = NULL)
Arguments
x |
Numeric vector or matrix |
y |
Optional second numeric vector |
Details
We sort the columns, take averages across rows, and then plug the averages back into the respective positions. The marginal distributions in the columns are thus forced to be the same. Missing values, which can result in differing numbers of observed values per column, are dealt with by linear interpolation.
Value
If two vectors, x
and y
, are provided, the output is a
matrix with two columns, with the quantile normalized versions of
x
and y
.
If y
is missing, x
should be a matrix, in which case the
output is a matrix of the same dimensions with the columns quantile
normalized with respect to each other.
Examples
z <- rmvn(10000, mu=c(0,5,10), V = rbind(c(1,0.5,0.5),c(0.5,1,0.5),c(0.5,0.5,1)))
z[sample(prod(dim(z)), 1500)] <- NA
pairs(z)
br <- seq(min(z, na.rm=TRUE), max(z, na.rm=TRUE), length=200)
par(mfrow=c(3,1))
for(i in 1:3)
hist(z[,i], xlab="z", main=i, breaks=br)
zn <- normalize(z)
br <- seq(min(zn, na.rm=TRUE), max(zn, na.rm=TRUE), length=200)
for(i in 1:3)
hist(zn[,i], xlab="normalized z", main=i, breaks=br)
pairs(zn)
[Package broman version 0.84 Index]