ALTopt (version 0.1.0)

convert.stress.level: Coding and decoding stress level

Description

Convert the stress levels from the actual levels to standardized levels, and vice versa.

Usage

convert.stress.level(lowStLv, highStLv, actual = NULL, stand = NULL)

Arguments

lowStLv

a numeric vector containing the actual lowest stress level of each stress variable in design region.

highStLv

a numeric vector containing the actual highest stress level of each stress variable in design region.

actual

a data frame or numeric vector containing the design points in actual units.

stand

a data frame or numeric vector containing the design points in standardized units.

Value

• When actual is provided, the function converts it to the standardized units and when stand is provided, the function converts it to the actual units.

Examples

# Generating D optimal design in coded unit.
  Design <- altopt.rc(optType = "D", N = 100, tc = 100, nf = 2, alpha = 1,
  formula = ~x1 + x2 + x1:x2, coef = c(0, -4.086, -1.476, 0.01))

  # Transform the coded unit to actual stress variable's level.
  convert.stress.level(lowStLv = c(34.834, 4.094), highStLv = c(30.288, 4.5),
  stand = Design$opt.design.rounded)

  # Transform the actual stress level to coded units.
  use <- c(38.281, 3.219)
  convert.stress.level(lowStLv = c(34.834, 4.094), highStLv = c(30.288, 4.5),
  actual = use)