timma (version 1.2.0)

sffsBinary2: Model selection with filtered binary drug-target interaction data

Description

A function to run sffs for model selection with filtered binary drug-target interaction data

Usage

sffsBinary2(profile_data, sens, sp = 1, max_k = 5, loo = TRUE,
  new_initial_list, verbosity = FALSE)

Arguments

profile_data

drug-target interaction data which is a matrix with drugs as row indexes and targets as column indexes.

sens

a drug sensitivity vector.

sp

an integer to specify the starting point for sequential forward floating search (sffs) search algorithm to navigate the target set space. By default, sp = 1.

max_k

an integer to sepcify the maximum number of targets that can be selected by the sffs algorithm. By default, max_k = 5. In practice it should not be over than 10 as the number of target combinations will increase exponentially.

loo

a logical value indicating whether to use the leave-one-out cross-validation in the model selection process. By default, loo = TRUE.

new_initial_list

a vector of the filtered targets indexes.

verbosity

a boolean value to decide if the information should be displayed. If it is TRUE, the information will be displayed while the model is running. Otherwise, the information will not be displayed. By default, it is FALSE.

Value

• A list containing the following components:
• timma
  a list contains: the predicted efficacy matrix, prediction error and predicted drug sensitivity
• k_sel
  the indexes for selected targets

Details

The major difference between original and modified averaging method is the averaging methods for the case where the minimization and maximization rules are not simultaneously satisfied. For example, for a queried target set there are supersets but not subsets in the training data, the original algorithm will take the prediction from these supersets data using the minimization rule. However, the modified algorithm will further adjust the prediction using the average between such a prediction and 0.

Examples

data(tyner_interaction_binary)
data(tyner_sensitivity)
profile<-tyner_interaction_binary[,c(-1, -2, -5)]
num<-length(tyner_sensitivity[,1])
k_set<-rep(0, dim(profile)[2])
k_set[1]<-1
result<-sffsBinary2(profile, tyner_sensitivity[,1], new_initial_list = k_set, max_k=2)