Dominance Index Calculator

Formula

The formula to calculate the Dominance Index (DI) is:

\[ DI = \left(\frac{S}{T}\right) \times 100 \]

Where:

Dominance Index: A statistical measure used in ecology to quantify the biodiversity of a habitat. It represents the degree to which a species dominates within a particular ecological community.

Let's say the number of species in the sample (S) is 50, and the total number of species in the population (T) is 200. Using the formula:

\[ DI = \left(\frac{50}{200}\right) \times 100 \]

We get:

\[ DI = 25\% \]

So, the Dominance Index is 25%.

Formula: \( D = \frac{\sum n_i (n_i - 1)}{N (N - 1)} \)

Example: \( D = \frac{40(40-1) + 30(30-1) + 20(20-1)}{90(90-1)} \)

Formula: \( d = \frac{2 \times (H - M)}{H + M} \)

Example: \( d = \frac{2 \times (15 - 10)}{15 + 10} \)

Formula: \( 1 - D \)

Example: \( 1 - D = 1 - 0.244 \)

Formula: \( D = \frac{\sum n_i (n_i - 1)}{N (N - 1)} \)

Example: \( D = \frac{50(50-1) + 25(25-1) + 25(25-1)}{100(100-1)} \)

Formula: \( D = \frac{\sum n_i (n_i - 1)}{N (N - 1)} \)

Example: \( D = \frac{60(60-1) + 20(20-1) + 20(20-1)}{100(100-1)} \)