If rating scores are publicly available, the statistics are based on submissions that opted in for release Regarding the a+ workshop > b conference i would say that this is very wishful. If scores are collected from the community via the google form, the statistics reflect only those samples.
Acceptance rates for the major ai conferences Most conferences explicitly allow for the submission of papers that had a preliminary version published at workshops Conferences often provide statistics for a particular year, presenting information such as acceptance rate, diversity, geographical and topic distribution, etc
Discover the conference on neural information processing systems (neurips), the world's leading interdisciplinary venue for machine learning, neuroscience, and ai research, its competitive acceptance rates, and why it's essential for researchers and practitioners. Corinna cortes and neil lawrence ran the nips experiment, where 1/10th of papers submitted to the neural information processing systems foundation (nips) went through the nips review process twice, and then the accept/reject decision was compared.