A single-step method for identifying individual resources

Many methods of analysis have been used to test whether animals use resources in proportion to availability. Many of the most commonly used methods have been criticized because they ignore the induced correlation among cells in the multinomial classification table due to the unit-sum constraint. Some methods are also flawed because they assume that relocation data can be pooled across animals even though the animals may select habitats differently. We propose a method, based on the maximum of the joint chi-square, to compare habitat usage to availability for individual animals. This method is combined with a follow-up multiple comparison technique that takes account of the unit-sum constraint. We compare our proposed method to a method based on the sum of individual chi-squares and a method based on compositional analysis by analyzing data on gray partridge and ringnecked pheasant resource use. Simulation is also used to compare methods by evaluating their Type I error rates.

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