id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-009797-8mdie73v	Valle, Denis	Extending the Latent Dirichlet Allocation model to presence/absence data: A case study on North American breeding birds and biogeographical shifts expected from climate change	2018-08-26		.txt	text/plain	5624	244	50	title: Extending the Latent Dirichlet Allocation model to presence/absence data: A case study on North American breeding birds and biogeographical shifts expected from climate change The Latent Dirichlet Allocation (LDA) model is a mixed‐membership method that can represent gradual changes in community structure by delineating overlapping groups of species, but its use has been limited because it requires abundance data and requires users to a priori set the number of groups. Furthermore, by comparing the estimated proportion of each group for two time periods (1997–2002 and 2010–2015), our results indicate that nine (of 18) breeding bird groups exhibited an expansion northward and contraction southward of their ranges, revealing subtle but important community‐level biodiversity changes at a continental scale that are consistent with those expected under climate change. It is important to note that even in the absence of MM sampling units, LDA can still estimate well the true number of groups and has similar fit to the data as the other clustering approaches (results not shown).	./cache/cord-009797-8mdie73v.txt	./txt/cord-009797-8mdie73v.txt