Average Levels of a Factor in a Data Matrix

Description

avgFacLvls takes a matrix and calculates the column means for each level of each factor given. It then replaces the original matrix rows with the means corresponding to the factor/level memership of a particular sample (row).

Usage

avgFacLvls(matrix, fac)

Arguments

Value

A matrix whose rows are composed of the column means for each level of the factor.

Author(s)

Matthew J. Keinsley and Bryan A. Hanson, DePauw University.

References

https://github.com/bryanhanson/ChemoSpec

See Also

aov_pcaSpectra for full details.

Examples

M1 <- matrix(rnorm(100), nrow = 20, byrow = TRUE)
facs <- factor(c(rep("A",5), rep("B",5), rep("C", 5), rep("D", 5)))
M2 <- avgFacLvls(M1, fac = facs)