Citation
Noble, D.G. & Gillings, S. 2023. Production of smoothed population trends when a key year of data is missing. BTO Research Report 748: British Trust for Ornithology, Thetford, UK
Overview
This report explores the impact on the direction and statistical confidence in the individual species trends from which the wild bird indicator is composed when including missing years in the dataset, using simulated subsets of real data from previous years. This report was prompted by the impacts of Covid-19 lockdown restrictions on survey effort.
