NEWS.md for v2.9.0

Author: jgabry

NEWS.md

@@ -1,6 +1,22 @@
-# loo 2.8.0.9000
+# loo 2.9.0
+
+* Avoid under and overflows in stacking by @avehtari in https://github.com/stan-dev/loo/pull/273
+* Fix `kfold_split_stratified()` when a group has 1 observation by @jgabry in https://github.com/stan-dev/loo/pull/278
+* Fix `plot_diagnostic(..., label_points = TRUE)` by @annariha in https://github.com/stan-dev/loo/pull/288
+* Use testthat 3e and rely on posterior for ESS by @VisruthSK in https://github.com/stan-dev/loo/pull/289
+* Fixed NAs in `psis_r_eff()`  by @VisruthSK in https://github.com/stan-dev/loo/pull/301
+* Print unequal sample sizes in loo_compare by @VisruthSK in https://github.com/stan-dev/loo/pull/307
+* New website theme and pkgdown workflow by @VisruthSK in https://github.com/stan-dev/loo/pull/292
+* Small fix in `loo_model_weights()` doc by @avehtari in https://github.com/stan-dev/loo/pull/276
+* loo_moment_match.R: fix doc for default k_threshold by @jgabry in https://github.com/stan-dev/loo/pull/279
+* Update scrps reference and improve doc by @avehtari in https://github.com/stan-dev/loo/pull/280
+* Fix url in vignette by @jgabry in https://github.com/stan-dev/loo/pull/282
+* Update stacking citation in inst/CITATION by @jgabry in https://github.com/stan-dev/loo/pull/284
+* Added contribution section. by @VisruthSK in https://github.com/stan-dev/loo/pull/286
+* Update LOO uncertainty paper to use BA doi by @avehtari in https://github.com/stan-dev/loo/pull/311
+* Update documentation for `E_loo()` function by @avehtari in https://github.com/stan-dev/loo/pull/312
+
 
-Items for next release go here
 
 # loo 2.8.0