maSigPro (version 1.44.0)

reg.coeffs: Calculate true variables regression coefficients

Description

reg.coeffs calculates back regression coefficients for true variables (experimental groups) from dummy variables regression coefficients.

Usage

reg.coeffs(coefficients, indepen = groups.vector[nchar(groups.vector)==min(nchar(groups.vector))][1], groups.vector,  group)

Arguments

coefficients

vector of regression coefficients obtained from a regression model with dummy variables

indepen

idependent variable of the regression formula

groups.vector

vector indicating the true variable of each variable in coefficients

group

true variable for which regression coefficients are to be computed

Value

reg.coeff

vector of calculated regression coefficients

Details

regression coefficients in coefficients vector should be ordered by polynomial degree in a regression formula, ie: intercept, $x$ term, $x^2$ term, $x^3$ term, and so on...

References

Conesa, A., Nueda M.J., Alberto Ferrer, A., Talon, T. 2005. maSigPro: a Method to Identify Significant Differential Expression Profiles in Time-Course Microarray Experiments.

Examples

groups.vector <-c("CT", "T1vsCT", "T2vsCT", "CT", "T1vsCT","T2vsCT", "CT", "T1vsCT", "T2vsCT")
coefficients <- c(0.1, 1.2, -0.8, 1.7, 3.3, 0.4, 0.0, 2.1, -0.9)
## calculate true regression coefficients for variable "T1"
reg.coeffs(coefficients, groups.vector = groups.vector, group = "T1")