Determine Decision Based on Decision String, Design and Look Information

This function takes a string indicating the desired decision ("Efficacy", "Futility", or "Continue"), design parameters, and look information, and returns the appropriate decision value. If LookInfo is not NULL, the function uses LookInfo$RejType to help determine the design type:

• LookInfo$RejType Codes:

  • Efficacy Only:

    • 1-Sided Efficacy Upper = 0

    • 1-Sided Efficacy Lower = 2

  • Futility Only:

    • 1-Sided Futility Upper = 1

    • 1-Sided Futility Lower = 3

  • Efficacy and Futility:

    • 1-Sided Efficacy Upper & Futility Lower = 4

    • 1-Sided Efficacy Lower & Futility Upper = 5

  • Additional Scenarios Not in East Horizon Explore:

    • 2-Sided Efficacy Only = 6

    • 2-Sided Futility Only = 7

    • 2-Sided Efficacy & Futility = 8

    • Equivalence = 9

The function also uses DesignParam$TailType to determine tail direction:

• 0: Left-tailed

• 1: Right-tailed

Based on the design type and tail direction, the function evaluates the decision and returns the corresponding integer decision value. Errors are raised for invalid input combinations.

Usage

GetDecision(strDecision, DesignParam, LookInfo)

Arguments

strDecision

A string indicating the desired decision: "Efficacy", "Futility", or "Continue".

DesignParam

A list containing design parameters sent from East Horizon Explore to the R integration for analysis.

LookInfo

A list containing look information sent from East Horizon Explore to the R integration for analysis.