Variance

{
  "id": "MLC-T-CHM-012517",
  "term": "Variance",
  "field": "Chemistry",
  "definition": "A measure of dispersion equal to the square of the standard deviation. For a sample it is the sum of squared deviations from the mean divided by n minus 1, and for a whole population it is the mean squared deviation. The variances of independent error components add, so the variance of a result equals the sum of the variances of its contributions.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "precision",
    "standard deviation"
  ],
  "references": [
    "Orange Book, 2nd ed., p. 5 (https://media.iupac.org/publications/analytical_compendium/)",
    "PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2218 (https://doi.org/10.1351/pac199062112167)",
    "PAC, 1994, 66, 595. 'Nomenclature for the presentation of results of chemical analysis (IUPAC Recommendations 1994)' on page 601 (https://doi.org/10.1351/pac199466030595)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/variance/"
}