cesr - Trend analysis of Constant Effort Site ringing data

Functions for reading EuroCES data in Euring format to produce annual indices of abundance, productivity and survival. Designed to primarily analyse data from schemes with 10-12 visits per year following methods used by the BTO. Use read.ces() to read in data, extract.data() and index() to do abundance/productivity trends and extract.ch() and mark.ces() to estimate survival probabilities.