File:The Wikipedia.org Portal and Ukrainian Wikipedia.pdf
English: On 16 August 2016, Discovery deployed a major design change to the Wikipedia.org Portal page. As of the deployment, the links to Wikipedia in 200+ languages have been put into a modal drop-down to make the page cleaner and less overwhelming to new visitors. Before that, Discovery added browser language preferences detection (via accept-language header) to the page so that users (who have their language preferences set in their browser) would see their language around the Wikipedia globe logo, without having to look for it in the long list of languages. Discovery received some criticism about the change, with some users hypothesizing that the change may have resulted in a decrease to Ukrainian Wikipedia's pageviews because some visitors may have Russian set as a language, but not Ukrainian. In this analysis, we use Bayesian structural time series models to model Ukrainian Wikipedia Main Page (since that's where the Portal leads to) pageviews from Russian-but-not-Ukrainian-speaking visitors to the Wikipedia.org Portal. The effect of the deployment was estimated to be negative in some models and positive in others — including ones that looked at Russian-and-Ukrainian-speaking visitors — but the 95% credible interval included 0 in all of them, meaning the deployment did not have a statistically significant effect. In other words, we do not have sufficient evidence to say that the language-dropdown deployment had a convincingly positive or negative impact on Ukrainian Wikipedia Main Page pageviews from the Wikipedia.org Portal.
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