Choosing an appropriate sample interval for instantaneous sampling.

When using instantaneous sampling for collecting data, the interval between two succeeding scans is crucial. Utilising either too short or too long time intervals may produce erroneous results. A three-step procedure for graphically determining optimal sample interval for a behaviour pattern of an individual is presented. Two examples, data of a computer simulation and a living antelope illustrate the procedure. Finally, some general recommendations for an application of the procedure are given.