Lexico-cultural decay?
Jonathan Merritt, "The Death of Sacred Speech", The Week 9/10/2018:
America boasts more Christians than any other country on planet Earth. But you wouldn't know it from listening to us.
According to Google Ngram Viewer data, a searchable database of millions of printed works stretching back 500 years, most of the central terms in the Christian vocabulary are rapidly declining. One 2012 study in the Journal of Positive Psychology, for example, analyzed 50 moral terms associated with Christianity and found that a whopping 74 percent were used less frequently over the course of the last century […]
"Whopping "? If the frequency of each word were following a random walk, we'd expect 50% of them to decline and 50% of them to increase. And to be confident that 74% is "whopping", or even meaningful, we'd need to do something that neither Merritt nor the cited paper do, namely verify that there's no overall bias in the data source for reasons other than changing "cultural salience", either towards decreasing frequency of certain types of words, or decreasing frequency of individual words in general, But in fact there's good reason to believe that both sorts of bias exist — see below.
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