NZGBS 2018 trend analysis methods

This report summarises the data editing, analysis and interpretation protocols for State of NZ Garden Birds 2018 | Te Āhua o ngā Manu o te Kāri i Aotearoa, which are as follows: • editing the raw bird count data ready for analysis • calculating changes in bird counts over the last 10-year and 5-year periods for a subset of widespread garden birds at national, regional and local scales • using a standardised set of criteria to help the user interpret the results and readily identify changes of potential concern or interest.