To find the upper quartiles y-axis value multiply the maximum cumulative frequency by ¾. Relative abundance Total noof species A Total noof individual of all species recorded x100 4. It gives the frequency per unit for the data in this class where the unit is the unit of measurement of the data.
Moss layer 001- 005 m 2.
Displaystyle f_ text c9 sqrt N_ text max where Nmax is maximum electron density per m 3 and fc is in Hz. This is called unequal class intervals. This is the basis for the equation. The frequency density can be calculated by using the following formula.