Alias structure

{
  "id": "MLC-T-CHM-000385",
  "term": "Alias structure",
  "field": "Chemistry",
  "definition": "The pattern of confounding between effects in a fractional factorial experimental design, where the estimates of certain main effects or interactions are indistinguishable from others. Because the design uses only a subset of the runs from a full factorial experiment, some higher-order interactions become aliased with main effects or lower-order interactions. For a two-level fractional design, the alias structure is determined by the design's defining relation or generator.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "aliased effects"
  ],
  "references": [
    "PAC, 2016, 88, 407. 'Vocabulary of concepts and terms in chemometrics (IUPAC Recommendations 2016)' on page 413 (https://doi.org/10.1515/pac-2015-0605)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/alias-structure/"
}