Index Period

{
  "id": "MLC-T-ENV-014069",
  "term": "Index Period",
  "field": "Environment",
  "definition": "1. The time period within a year selected for measurement (ecologically based). Measurements may be taken once or more often during the time period, with the response design providing the protocol for obtaining a single value for each indicator. Indicator variability within Index period contributes to non-survey sampling error.\n\n2. The period of the year when measurement of an indicator yields meaningful information.\n\n3. In EPA’s aquatic resource monitoring, a term used to describe the portion of the year when data are collected. The index period is often selected based on ecological considerations.",
  "subject": "General environmental",
  "references": [
    "Aquatic Resource Monitoring - Terminology",
    "Environmental Modeling and Assessment Program (EMAP) Master Glossary",
    "Report on the Environment (ROE) Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/index-period/"
}