itemValuesRangeConstraint: Create single value constraints with minimum and maximum.

In eatATA: Create Constraints for Small Test Assembly Problems

Create single value constraints with minimum and maximum.

Description

itemValuesRangeConstraint, itemValuesMinConstraint, and itemValuesMaxConstraint create constraints related to an item parameter/value. That is, the created constraints assure that the sum of the itemValues is smaller than or equal to max, greater than or equal to min, or both range.

Usage

itemValuesRangeConstraint(
  nForms,
  itemValues,
  range,
  whichForms = seq_len(nForms),
  info_text = NULL,
  itemIDs = names(itemValues)
)

itemValuesMinConstraint(
  nForms,
  itemValues,
  min,
  whichForms = seq_len(nForms),
  info_text = NULL,
  itemIDs = names(itemValues)
)

itemValuesMaxConstraint(
  nForms,
  itemValues,
  max,
  whichForms = seq_len(nForms),
  info_text = NULL,
  itemIDs = names(itemValues)
)

itemValuesDeviationConstraint(
  nForms,
  itemValues,
  targetValue,
  allowedDeviation,
  relative = FALSE,
  whichForms = seq_len(nForms),
  info_text = NULL,
  itemIDs = names(itemValues)
)

Arguments

nForms	Number of forms to be created.
itemValues	Item parameter/values for which the sum per test form should be constrained.
range	a vector with two values, the the minimal and the maximum sum of the itemValues per test form, respectively
whichForms	An integer vector indicating which test forms should be constrained. Defaults to all the test forms.
info_text	a character string of length 1, to be used in the "info"-attribute of the resulting constraint-object.
itemIDs	a character vector of item IDs in correct ordering, or NULL.
min	the minimal sum of the itemValues per test form
max	the minimal sum of the itemValues per test form
targetValue	the target test form value.
allowedDeviation	the maximum allowed deviation from the targetValue
relative	a logical expressing whether or not the allowedDeviation should be interpreted as a proportion of the targetValue

Details

itemValuesDeviationConstraint also constrains the minimal and the maximal value of the sum of the itemValues, but based on a chosen and a maximal allowed deviation (i.e., allowedDeviation) from that targetValue.

Value

An object of class "constraint".

Functions

• itemValuesMinConstraint(): constrain minimum value

• itemValuesMaxConstraint(): constrain maximum value

• itemValuesDeviationConstraint(): constrain the distance form the targetValue

Examples

## constraints to make sure that the sum of the item values (1:10) is between
## 4 and 6
itemValuesRangeConstraint(2, 1:10, range(min = 4, max = 6))

## or alternatively
itemValuesDeviationConstraint(2, 1:10, targetValue = 5,
allowedDeviation = 1)

eatATA documentation built on May 29, 2024, 2:56 a.m.