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Middleton Island tufted puffin diets

Middleton_Island_TUPU.Rd

Data to demonstrate multivariate Tweedie GAM for time-series

Usage

data(Middleton_Island_TUPU)

Value

A data long-form data frame

Details

Data sufficient to demonstrate how to use a Tweedie Generalized Additive Model to provide inference about proportions e.g. in food habits analysis, where the model output is processed to represent a multivariate logit Tweedie model.

Specifically includes Tufted Puffin (Fratercula cirrhata) bill loads sampled at Middleton Island.

  • Response Numeric prey biomass in bill load samples

  • Year Numeric year

  • group factor representing prey species or category

  • SampleID factor with a level for every sampling occasion, e.g., for use in row normalization

References

Hatch, S., and G. Sanger. 1992. Puffins as Samplers of Juvenile Pollock and Other Forage Fish in the Gulf of Alaska. Marine Ecology Progress Series 80: 1-14.

Author

Mayumi Arimitsu