Single Species Density Estimates Using the Point-Center Quarter Method

This applet may be used to calculate the density of a single species or type (number per hectare) with data collected using the Point-Center Quarter Method. For each quarter (Columns I, II, III, and IV) at each point, enter the distance (in meters) from the point to nearest individual in the quarter.

Use the "Calculate" button to obtain the density estimate. A 95% confidence interval for the density is also calculated. Caution: The confidence interval calculation is valid only if the number of points n is at least 7.

For information on the Point-Center Quarter Method, read the PDF file Quantitative Analysis by the Point-Center Quarter Method. Section 12 describes the computations carried out by this calculator.

Related Site: Calculating Importance Values Using the Point-Center Quarter Method and its Help Page.