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Utilization

Specific Guidelines on Sample Unit Size for Frequency

Specific Guidelines on Sample Unit Size for Density

Specific Guidelines on Sample Unit Size for Biomass

Sample Unit Size

Rangeland Inventory, Monitoring, and Evaluation: Vegetation Attributes

Rangeland Inventory, Monitoring, and Evaluation:
Vegetation Attributes

Introduction | General Principles | Sampling Concepts | Vegetation Attributes
Rangeland Evaluation | Management Applications | Chapter Outline

Sample Variance

Sample Variance

The sample variance (s²) is a measure of dispersal that reflects the spread of data around the sample mean. The sample variance is calculated as

Comparison Areas

Weight-Estimate Method

allocation

Allocation of Sample Units - Sampling Designs

Decisions relating to the arrangement of sample units within the site have a large influence on sample precision, sample efficiency, and statistical models used to analyze the data. These decisions are an important component of designing the inventory or monitoring program before the data is actually collected.