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The vignette title specified in \VignetteIndexEntry{} is different from the title in the YAML metadata. The former is "Graphical posterior predictive checks", and the latter is "Graphical posterior predictive checks using the bayesplot package". If that is intentional, you may set options(rmarkdown.html_vignette.check_title = FALSE) to suppress this check.

The vignette title specified in \VignetteIndexEntry{} is different from the title in the YAML metadata. The former is "Plotting MCMC draws", and the latter is "Plotting MCMC draws using the bayesplot package". If that is intentional, you may set options(rmarkdown.html_vignette.check_title = FALSE) to suppress this check.