Density Frequency Frequency - used to determine vegetation condition and trend. Provides a direct count of individuals per unit area. Quick estimate of species composition. Reduces surveyor bias from pin placement. Simple to obtain, rapid and objective.
Nested frequency is an effective technique to estimate frequency for a number of species.
Reduces surveyor bias compared to other techniques. Limitations Subjective and dependent upon the experience and knowledge of the vegetation type by the surveyor. Quadrat size is important. If the quadrat is too small the variation will be high and conversely a large quadrat will be too time consuming. Unable to conduct statistical analysis for change over time because of the bias.