eatATA (version 1.1.2)

itemValuesRangeConstraint: 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)
)

Value

An object of class "constraint".

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

Functions

• itemValuesMinConstraint(): constrain minimum value

• itemValuesMaxConstraint(): constrain maximum value

• itemValuesDeviationConstraint(): constrain the distance form 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.

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)