dtComb (version 1.0.7)

helper_minimax: Helper function for minimax method.

Description

The helper_minimax function calculates the combination coefficient and optimized value of given biomarkers for the minimax method.

Usage

helper_minimax(t, neg.set, pos.set, markers, status)

Value

A numeric Optimized value calculated with combination scores using t

Arguments

t

a numeric parameter that will be estimated in minimax method for the combination score

neg.set

a numeric data frame that contains the observation with negative status

pos.set

a numeric data frame that contains the observation with positive status

markers

a numeric data frame that contains the biomarkers

status

a factor data frame that includes the actual disease status of the patients

Author

Serra Ilayda Yerlitas, Serra Bersan Gengec, Necla Kochan, Gozde Erturk Zararsiz, Selcuk Korkmaz, Gokmen Zararsiz

Examples

# call data
data(laparotomy)

# define the function parameters
markers <- cbind(laparotomy$ddimer, laparotomy$log_leukocyte)
status <- factor(laparotomy$group, levels = c("not_needed", "needed"))

neg.set <- markers[status == levels(status)[1], ]
pos.set <- markers[status == levels(status)[2], ]

t <- 0.5

stat <- helper_minimax(t,
  neg.set = neg.set, pos.set = pos.set,
  markers = markers, status
)