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Metropolitan DC Local Politics
Reply to "Ridership data demonstrate massive growth in bicycle use in DC"
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[quote=Anonymous][quote=Anonymous][quote=Anonymous]The other thread also reminded me that I need to cancel my WaPo subscription. How can you work as a journalist for that long and not understand a concept as basic as confidence intervals?[/quote] Well. Journalists don't have to take statistics. Also, confidence intervals are for random samples, and crash data aren't random samples. But yeah, it was a stupid column.[/quote] That was a reference to the assertion made in the article that the proportion of people commuting by bike has declined since 2017. This assertion is entirely based on point estimates drawn from small samples. However, once confidence intervals are accounted for, it would be clear that we don’t know whether bicycle commuters have proportionately increased, decreased, or stayed the same.[/quote]
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