#' @title calculate the critical value of SSMD between a positive control and
#' a negative reference in a data frame for an HTS study
#' @description A function to calculate the critical value of SSMD between a positive control and
#' a negative reference in a data frame for an HTS study
#' @param dataIn.df a data frame with plate ID (or name), well usage and intensity
#' @param negREF name of wells to be used as a negative reference
#' @param positiveCTRL name of wells to be used as a positive control
#' @param pREFtrim the total portion of data to be trimmed in the negative reference
#' @param Alpha specify the significant level
#' @param Beta the population value of SSMD
#'
#' @author Xiaohua Douglas Zhang and Dandan Wang 07/2020
#' @return a matrix containing estimated SSMD value and variance for each plate
#' @examples data("data.CVB3CRISPR", package="qcSSMD")
#' data.df = dataCVB3.df
#' ssmdC.homoVAR.frame.fn(dataIn.df=data.df, negREF="Sample", positiveCTRL="Positive Control",
#' pREFtrim=0.05, Alpha=0.05, Beta=3)
#'
#' @export
ssmdC.homoVAR.frame.fn =
function(dataIn.df, negREF="Sample", positiveCTRL="positive control", pREFtrim=0, Alpha=0.05, Beta=3)
{
#*****************************************************************************
# function to calculate the critical value of SSMD between a positive control and
# a negative reference in a data frame for an HTS study
# Author: Xiaohua Douglas Zhang and Dandan Wang 07/2020
# Input
# dataIn.df: a data frame with plate ID (or name), well usage and intensity
# negREF: name of wells to be used as a negative reference
# positiveCTRL: name of wells to be used as a positive control
# pREFtrim: the total portion of data to be trimmed in the negative reference
# Alpha: specify the significant level
# Beta: the population value of SSMD
# Output
# a matrix containing estimated SSMD value and variance for each plate.
# Example:
# library(qcSSMD)
# data("data.CVB3CRISPR", package="qcSSMD")
# data.df = dataCVB3.df
# ssmdC.homoVAR.frame.fn(dataIn.df=data.df, negREF="Sample", positiveCTRL="Positive Control",
# pREFtrim=0.05, Alpha=0.05, Beta=3)
#*****************************************************************************
plateID.vec = dataIn.df[,1]
plateUniq.vec = unique(plateID.vec)
nPlate = length( plateUniq.vec )
N = length(plateID.vec)
ssmdC.mat = matrix(NA, nrow=nPlate, ncol=3)
for( i in 1:nPlate) {
theData.df = dataIn.df[ plateID.vec == plateUniq.vec[i], ]
inten.vec = theData.df[, 3]
wellusage = theData.df[, 2]
x = inten.vec[wellusage == negREF]
y = inten.vec[wellusage == positiveCTRL]
x = x[ !is.na(x) ]
xSort = sort(x)
nS1 = length(x)
nRm = round(nS1*pREFtrim/2)
xTrim.vec = xSort[ (nRm+1): (nS1-nRm) ]
n1 = nS1 - nRm*2
y = y[ !is.na(y) ]
n2 = length(y)
ssmdC.mat[i, ] = c(n1, n2, ssmdC.homoVAR.fn(n1, n2, Alpha, Beta))
}
dimnames(ssmdC.mat)= list(plateUniq.vec, c("nNeg", "nPos", "ssmdC"))
return( ssmdC.mat )
}
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